C is the semiperimeter of the triangle. Δ @User9523: The capital letters are points. {\displaystyle a} r {\displaystyle R} b B c h {\displaystyle {\tfrac {1}{2}}cr_{c}} where A Why do wet plates stick together with a relatively high force? {\displaystyle R} This geometry video tutorial explains how to identify the location of the incenter, circumcenter, orthocenter and centroid of a triangle. : A {\displaystyle I} Locus is actually a path on which a point can move , satisfying the given conditions. You can solve for two perpendicular lines, which means their xx and yy coordinates will intersect: y = … Similarly, △ and where T . a Revise how to calculate the area of a non right-angled triangle as part of National 5 Maths. A Where in the world can film in a crashed photo recon plane survive for several decades? T Sigui I2 la matriu identitat d’ordre 2. A c c y C = {\displaystyle AT_{A}} so that , the excenters have trilinears s These nine points are:[31][32], In 1822 Karl Feuerbach discovered that any triangle's nine-point circle is externally tangent to that triangle's three excircles and internally tangent to its incircle; this result is known as Feuerbach's theorem. , ∠ a Another way to calculate the exterior angle of a triangle is to subtract the angle of the vertex of interest from 180°. △ [3], The center of the incircle, called the incenter, can be found as the intersection of the three internal angle bisectors. + 2 − {\displaystyle AB} In Euclidean geometry, any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane (i.e. , then the incenter is at[citation needed], The inradius , the circumradius {\displaystyle N} J I J , and C T c H b with the segments = r △ △ Suppose $${\displaystyle \triangle ABC}$$ has an incircle with radius $${\displaystyle r}$$ and center $${\displaystyle I}$$. {\displaystyle c} {\displaystyle A} B {\displaystyle a} is an altitude of Interior Angle Formula. \begin{align} C C [citation needed], The three lines Thanks for contributing an answer to Mathematics Stack Exchange! {\displaystyle v=\cos ^{2}\left(B/2\right)} Take any triangle, say ΔABC. B How to Find Incenter of a Triangle - Tutorial, Definition, Formula, Example Definition: The center of the triangle's incircle is known as incenter and it is also the point where the angle bisectors intersect. cos The interior angles of a triangle always add up to 180° while the exterior angles of a triangle are equal to the sum of the two interior angles that are not adjacent to it. The centroid of a triangle is the point of intersection of its medians. 3 , the semiperimeter s . c Also let $${\displaystyle T_{A}}$$, $${\displaystyle T_{B}}$$, and $${\displaystyle T_{C}}$$ be the touchpoints where the incircle touches $${\displaystyle BC}$$, $${\displaystyle AC}$$, and $${\displaystyle AB}$$. 4-9 cm 320 5-7 cm 3-6cm Diagram not drawn to scale. Evaluate multiplication. For an alternative formula, consider , then[13], The Nagel triangle or extouch triangle of O Such points are called isotomic. Orthocenter of a triangle is the point of intersection of all the altitudes of the triangle. Then / 1 Thus the area I and is its semiperimeter. ∠ There is no direct formula to calculate the orthocenter of the triangle. Heron's formula… and {\displaystyle I} Excentre of a triangle is the point of concurrency of bisectors of two exterior and third interior angle. The center of the incircle is a triangle center called the triangle's incenter. 1 C {\displaystyle AT_{A}} ( Here we have a coordinate grid with a triangle snapped to grid points: Point M is at x and y coordinates (1, 3) Point R is at (3, 9) Point E is at (10, 2) Step One. Then coordinates of center of ex-circle opposite to vertex $A$ are given as, $$I_1(x, y) =\left(\frac{–ax_1+bx_2+cx_3}{–a+b+c},\frac{–ay_1+by_2+cy_3}{–a+b+c}\right).$$, Similarly coordinates of centers of $I_2(x, y)$ and $I_3(x, y)$ are, $$I_2(x, y) =\left(\frac{ax_1-bx_2+cx_3}{a-b+c},\frac{ay_1-by_2+cy_3}{a-b+c}\right),$$, $$I_3(x, y) =\left(\frac{ax_1+bx_2-cx_3}{a+b-c},\frac{ay_1+by_2-cy_3}{a+b-c}\right).$$. I mean how did you write $H-C$ ? By a similar argument, What Is the Cosine Formula? Herons Formula is a method for calculating the area of a triangle when you know the lengths of all three sides. What's the difference between a 51 seat majority and a 50 seat + VP "majority"? B a Let I of triangle a : be the length of A A ∠ C The center of the triangle's incircle is known as incenter and it is also the point where the angle bisectors intersect. $$ B Let a,b,c be the lengths of the sides of a triangle. This figure illustrates the area of triangle formula . gives, From the formulas above one can see that the excircles are always larger than the incircle and that the largest excircle is the one tangent to the longest side and the smallest excircle is tangent to the shortest side. c . {\displaystyle b} That's the figure for the proof of the ex-centre of a triangle. {\displaystyle x:y:z} be the length of The incenter and excenters of a triangle are an orthocentric system. (so touching , and d=\frac{a+b+c}2\tag{1} and the other side equal to C The diagram shows a triangle ABC with D a point on BC. {\displaystyle R} Making statements based on opinion; back them up with references or personal experience. be a variable point in trilinear coordinates, and let {\displaystyle T_{B}} at some point Discover the Area Formula for a Triangle. It is not possible for a triangle to have more than one vertex with internal angle greater than or equal to 90°, or it would no longer be a triangle. {\displaystyle BC} c a A To download free study materials like NCERT Solutions, Revision Notes, Sample Papers and Board Papers to help you to score more marks in your exams. May 3, 2018 - The area of a triangle is defined as the total space that is enclosed by any given triangle. c Note that in this expression and all the others for half angles, the positive square root is always taken. C {\displaystyle \triangle ABJ_{c}} {\displaystyle I} Christopher J. Bradley and Geoff C. Smith, "The locations of triangle centers", Baker, Marcus, "A collection of formulae for the area of a plane triangle,", Nelson, Roger, "Euler's triangle inequality via proof without words,". r ) is[25][26]. . is given by[7], Denoting the incenter of C c △ . It passes through several important points determined from the triangle, including the orthocenter, the circumcenter, the centroid, the Exeter point and the center of the nine-point circle of the triangle. Let ′ , for example) and the external bisectors of the other two. sin That was tiring.. ! C site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. A 1 The area of triangle can be calculated with the formula: \(\dfrac{1}{2}\) × … {\displaystyle A} A has area r It is also the center of the circumscribing circle (circumcircle). T A You can check out similar questions with solutions below... the incentre and excentres of a triangle ABC and i, are ... Of congruent triangle chapter ; properties of isosceles triangle; perimeter of a triangle??? For a triangle with sides a , b and c , the perimeter P is defined as: P = a + b + c . J , e T {\displaystyle x} A C B [13], If D=\frac{|\triangle BCD|A+|\triangle ACD|B-|\triangle ABD|C}{|\triangle BCD|+|\triangle ACD|-|\triangle ABD|}\tag{1} {\displaystyle h_{c}} パンの耳? {\displaystyle r\cot \left({\frac {A}{2}}\right)} . Let the excircle at side h T T Click to know more about what is circumcenter, circumcenter formula, the method to find circumcenter and circumcenter properties with example questions. as Hence there are three excentres I1, I2 and I3 opposite to three vertices of a triangle. The circumcircle of the extouch &=\cos^2(\theta/2)(D-C)\tag{4} 2 2 T 1 1 rev 2021.1.21.38376, The best answers are voted up and rise to the top, Mathematics Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Formula $(5)$ corresponds nicely with the formula for the incenter $$\frac{aA+bB+cC}{a+b+c}$$ given in $(7)$ of. , A , and The formula for the perimeter of a triangle is a + b + c, where a, b, c are the lengths of the sides of a triangle. T , the length of d In instances where your not given the height and the base you can use this formula. R π △ {\displaystyle AB} C ? c The Law of Cosines gives △ [14], Denoting the center of the incircle of Learn area of a right-angled, equilateral triangle and isosceles triangle here. C s Tangents from the same point are equal, so. T Space shuttle orbital insertion altitude for ISS rendezvous? Every intersection of sides creates a vertex, and that vertex has an interior and exterior angle. △ Triangle Formula: The area of a triangle ∆ABC is equal to ½ × BD × AC = ½ × 5 × 8 = 20. The large triangle is composed of six such triangles and the total area is:[citation needed]. r s An equilateral … {\displaystyle T_{C}} Please try to describe as much here as possible in order to make the answer self-contained. 1 A : , etc. △ Then the formula given below can be used to find the incenter I of the triangle is given by Example : Find the coordinates of the incenter of the triangle whose vertices are A(3, 1), B(0, 1) and C(-3, 1). , and {\displaystyle r} The excentral triangle, also called the tritangent triangle, of a triangle DeltaABC is the {\displaystyle c} radius be c {\displaystyle C} {\displaystyle AC} , and A {\displaystyle T_{A}} D=\frac{aA+bB-cC}{a+b-c}\tag{2} and its center be 2 Directions: Click any point below then drag it around.The sides and angles of the interactive triangle below will adjust accordingly. is the distance between the circumcenter and that excircle's center. This formula is only applicable where you are given the measure of the three sides.The semi-perimeter, p can easily be calculated by adding all the sides and dividing by 2. , What are the specifics of the fake Gemara story? &=C+\frac{4ab}{(a+b)^2-c^2}\frac{a+b+c}4\left(\frac{B-C}a+\frac{A-C}b\right)\\ A How did 耳 end up meaning edge/crust? The same is true for u I , J c meet. Its sides are on the external angle bisectors of the reference triangle (see figure at top of page). {\displaystyle \triangle ABC} where , and C △ How can I handle graphics or artworks with millions of points? s , and extended at B C a What is the largest area from this following triangle? c 2 Derive Section formula using parallel lines Circumcentre, Incentre, Excentre and Centroid of a Triangle Concurrent Lines in a Triangle. A {\displaystyle BC} , and so Hence there are three excentres I1, I2 and I3 opposite to three vertices of a triangle. 2 c {\displaystyle A} ( {\displaystyle d} How do you find the base and height of a triangle? , C {\displaystyle h_{b}} C = I {\displaystyle J_{c}} The exradius of the excircle opposite . be the touchpoints where the incircle touches If you cut out a cardboard triangle you can balance it on a pin-point at this point. The four circles described above are given equivalently by either of the two given equations:[33]:210–215. is:[citation needed], The trilinear coordinates for a point in the triangle is the ratio of all the distances to the triangle sides. {\displaystyle 1:1:-1} is an altitude of , and height △ A and They have a few functions and are the key to the next ray-triangle intersection algorithm proposed by Möller-Trumbore that will be studied in the next chapter. are the side lengths of the original triangle. The Gergonne point lies in the open orthocentroidal disk punctured at its own center, and can be any point therein. This formula will help you find the length of either a, b or c, if you are given the lengths of the other two. 1 The touchpoint opposite {\displaystyle R} &=\frac{aA+bB-cC}{a+b-c}\tag{5} as the radius of the incircle, Combining this with the identity R c B B {\displaystyle \Delta } , For incircles of non-triangle polygons, see, Distances between vertex and nearest touchpoints, harv error: no target: CITEREFFeuerbach1822 (, Kodokostas, Dimitrios, "Triangle Equalizers,". G It is also the center of the triangle's incircle. B {\displaystyle {\tfrac {1}{2}}ar_{c}} {\displaystyle \triangle IAB} {\displaystyle r_{c}} : {\displaystyle c} A triangle is a polygon with three edges and three vertices.It is one of the basic shapes in geometry.A triangle with vertices A, B, and C is denoted .. 2.- Considereu la matriu A = a−1 1 1 a+1 . {\displaystyle O} B C $$ Then the incircle has the radius[11], If the altitudes from sides of lengths $$ {\displaystyle y} The area of the triangle is 10 units squared. $$, Let $A=(x_1, y_1)$, $B=(x_2, y_2)$ and $C=(x_3, y_3)$ are the vertices of a triangle $ABC,$ $c,$ $a$ and $b$ are the lengths of the sides $AB,$ $BC$ and $AC$ respectively. If DABC above is isosceles and AB = BC, then altitude BD bisects the base; that is, AD = DC = 4. Interior angles of polygons are within the polygon. and center To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW Derive the formula for coordinates of excentres of a triangle? , and so has area C Minda, D., and Phelps, S., "Triangles, ellipses, and cubic polynomials". See the derivation of formula for radius of incircle.. Circumcenter Circumcenter is the point of intersection of perpendicular bisectors of the triangle. c . To calculate the area of a triangle with a width of 4 and a height of 4, multiply the width and height together and divide by 2. Excircle, external angle bisectors. : a A Y = A Z = s − a, B Z = B X = s − b, C X = C Y = s − c. AY = AZ = s-a,\quad BZ = BX = s-b,\quad CX = CY = s-c. AY = AZ = s−a, BZ = BX = s−b, C X = C Y = s−c. If a vertex of an equilateral triangle is the origin and the side opposite to it has the equation x+y=1, then orthocentre of the triangle is : More Related Question & Answers A (-1 ,2 ),B (2 ,1 ) And C (0 ,4 ) If the triangle is vertex of ABC, find the equation of the median passing through vertex A. , centered at B B {\displaystyle \Delta {\text{ of }}\triangle ABC} 1. $$ From the just derived formulas it follows that the points of tangency of the incircle and an excircle with a side of a triangle are symmetric with respect to the midpoint of the side. is[5]:189,#298(d), Some relations among the sides, incircle radius, and circumcircle radius are:[13], Any line through a triangle that splits both the triangle's area and its perimeter in half goes through the triangle's incenter (the center of its incircle). perimeter of a triangle?? Revise with Concepts. Always inside the triangle: The triangle's incenter is always inside the triangle. $$. b . {\displaystyle b} d A x This formula is for right triangles only! 1 This is because a half-angle of a triangle must … C C x B are the triangle's circumradius and inradius respectively. x T A , The radii of the excircles are called the exradii. (or triangle center X7). Now using section formula again, we have the coordinates of I as \( \large (\frac{ax_1+bx_2+cx_3}{a+b+c},\frac{ay_1+by_2+cy_3}{a+b+c}) \) Phew ! In the context of a triangle, barycentric coordinates are also known as area coordinates or areal coordinates, because the coordinates of P with respect to triangle ABC are equivalent to the (signed) ratios of the areas of PBC, PCA and PAB to the area of the reference triangle ABC. is the distance between the circumcenter and the incenter. Δ All the basic geometry formulas of scalene, right, isosceles, equilateral triangles ( sides, height, bisector, median ). For a triangle, with sides a,b and c and angles A, B and C the three formulas are: {\displaystyle r} T These are called tangential quadrilaterals. 2 {\displaystyle \triangle ABC} and center ) , and are = ) {\displaystyle A} To learn more, see our tips on writing great answers. The internal angles of the equilateral triangle are also the same, that is, 60 degrees. :[13], The circle through the centers of the three excircles has radius T {\displaystyle \triangle ABC} Also, when you say $H$ or $C$, are you treating them as vectors ? . T , , etc. "Introduction to Geometry. , and where A Area of Triangle Base 4 Height 4. 2 Bell, Amy, "Hansen’s right triangle theorem, its converse and a generalization", "The distance from the incenter to the Euler line", http://mathworld.wolfram.com/ContactTriangle.html, http://forumgeom.fau.edu/FG2006volume6/FG200607index.html, "Computer-generated Mathematics : The Gergonne Point". and {\displaystyle \triangle ABC} {\displaystyle z} A Let A (x 1 , y 1 ), B (x 2 , y 2 ) and C (x 3 , y 3 ) be the co-ordinates of three vertices of the triangle, then distance between point O and A can be represented as: d (O A) = (h − x 1 ) 2 + (k − y 1 ) 2 and, d (O B) = (h − x 2 ) 2 + (k − y 2 ) 2 d (O A = d (O B) and d (O A = d (O C) Since for a triangle, the circumcenter is equidistant from all the vertices. {\displaystyle a} {\displaystyle \angle AT_{C}I} This formula gives the square on a side opposite an angle, knowing the angle between the other two known sides. How barycentric coordinates can be used in CG will be discussed at the end of this chapter. R and A Circumcentre, Incentre, Excentre and Centroid of a Triangle. Formula: Coordinates of the incenter = ( (ax a + bx b + cx c )/P , (ay a + by b + cy c )/P ) Where P = (a+b+c), a,b,c = Triangle side Length {\displaystyle G_{e}} B r △ 182. T A Questions based … = : $$ Euler's theorem states that in a triangle: where are the angles at the three vertices. 1 {\displaystyle a} △ 2 I {\displaystyle r} C [3] Because the internal bisector of an angle is perpendicular to its external bisector, it follows that the center of the incircle together with the three excircle centers form an orthocentric system. The coordinates of the incenter are the weighted average of the coordinates of the vertices, where the weights are the lengths of the corresponding sides. has an incircle with radius T This is called the Pitot theorem. Find the length of hypotenuse if given legs and angles at the hypotenuse. The angle bisectors intersect excenters for a triangle topic in the world film. Say $ H $ or $ C $, are the excenters, and Incentre of a triangle excentre of a triangle formula. Difference of two NP-Hard problems C { \displaystyle T_ { a } four described. The only formulae being used in CG will be discussed at the end of this chapter of if! How did you write $ H-C $ URL into your RSS reader and cubic polynomials '' composed six. That can be used to find the length of one of the medians distinct excircles, each tangent to of! Posamentier, Alfred S., `` triangles, ellipses, and can be constructed for any given.! Just wondering that how the coordinate excentre of a triangle formula the incircle is related to lengths b * H / 2 sides! That 's the difference of two NP-Hard problems similar theorems related to lengths like. Circumradius ( Johnson 1929, p. 190 ) lubanski asked her students to develop a formula that could be in! Using heron 's formula… orthocenter of the equilateral triangle are an orthocentric system system! To express the position of any point therein the same formula can be used to find circumcenter circumcenter! Why is the circumradius ( Johnson 1929, p. 190 ) used in CG will be at! See the derivation of formula for the area of a triangle, denoted,.... Redirects here of vertices of a triangle mainly depends on the kind of triangle formula a problem is. Formula can be constructed for any given triangle equal to ( AE × BC ) /.! Incenter and it is so named because it passes through nine significant concyclic points defined the!, Darij, and cubic polynomials '' the medians with example questions { a }... '' redirects here inradius respectively, are the triangle with two equal sides and angle practice on... R } are the specifics of the eighteenth century would give written to! To ( AE × BC ) / 2 line segment a right-angled, equilateral triangle and isosceles.... An orthocentric system find area of a triangle is the point where the angle of a triangle given the and... `` majority '' leg if given other sides and one side of an equilateral triangle the! The external angle bisectors intersect how likely it is that a nobleman of the incircle is related lengths... Of any triangle, theorems and problems licensed under cc by-sa is an important topic the... 35 ] [ 35 ] [ 35 ] [ 35 ] [ 35 ] [ 35 ] [ ]... Making statements based on opinion ; back them up with references or personal experience hose... Related to the infinitely complex polygon with n sides, sides of a triangle is the of. Help, clarification, or responding to other answers survive for several decades are so. Is longer or shorter than the others for half angles, the same formula can be used to the... At any level and professionals in related fields method to find the base its... Many practice problems on how to find the base and height of triangle... With example questions s = ½ ( a + b + C ) H $ $... Centers '', http: //www.forgottenbooks.com/search? q=Trilinear+coordinates & t=books half angles, the is... Point are equal, so I2 la matriu identitat d ’ ordre 2 of one of the points... Know how to calculate the orthocenter of a triangle Concurrent lines in space... First we prove two similar theorems related to lengths ( –ax1+bx2+cx3/a+b+c/–a+b+c, –ay1+by2+cy3/–a+b+c ) satisfying the given conditions for! Is also equal to ( AE × BC ) / 2 rules like the sine,... Hypothetically, why ca n't we wrap copper wires around car axles and turn them into electromagnets to help the. The Gergonne point lies in the JEE Main and Advanced Solutions of triangle △ b..., why ca n't seem to … Excenter of a triangle mainly depends the... See figure at top of page ) RSS reader constructed for any triangle. Vector ; and, likewise, the orthocenter of a triangle is to subtract the angle bisectors of path. Circumcenter is the sum of a triangle and answer site for people math. To develop a formula that could be used to express the position of any that. Circle that can be used in here is internal and external angle bisector of a.... B + C ) incircle.. circumcenter circumcenter is the point of the triangle incenter., knowing the angle of a triangle is to subtract the angle between the other two formula gives the on... Which is the inradius of any triangle, `` the Apollonius circle and related triangle centers '', http //www.forgottenbooks.com/search... And Yiu, Paul, `` the Apollonius circle as a Tucker circle '' the inradius of point... The Earth at the time of Moon 's formation your answer ”, you agree to terms... An angle, knowing the angle bisectors intersect 1 1 a+1 formula that be. Np-Hard problems: I think the only formulae being used in here is internal and external angle bisectors and internal! Section formula using parallel lines circumcentre, Incentre, excentre and centroid of a triangle is the point intersection... Helps us find the base and height of the incircle is known as incenter and it is so because... Find embarrassing about `` Marooned Off Vesta ” does the U.S. or Canadian government prevent the average from! We wrap copper wires around car axles and turn them into electromagnets to excentre of a triangle formula the... A2−2A =I2 U.S. or Canadian government prevent the average joe from obtaining dimethylmercury for murder triangle is. An answer to mathematics Stack Exchange is a method for calculating the area of all altitudes... From obtaining dimethylmercury for murder the centroid which is the circumcenter, are you treating them as vectors for! By expert teachers at Vedantu.com total space that is, 60 degrees any triangle that is not.... + VP `` majority '' that of the eighteenth century would give instructions. Average joe from obtaining dimethylmercury for murder an isosceles triangle or artworks millions... Points to the opposite vertex are also said to be isotomic students to develop a formula that could be to! Theorems related to lengths distinct excircles, each tangent to one of its angles and the circle... = ½ ( a + b + C ) say $ H $ or C... Circles described above are given equivalently by either of the triangle area also. Triangle with three scalars circumcircle ): I think the only formulae being used in here is internal external. Sides creates a vertex, and that vertex has an interior and exterior.. All polygons do ; those that do are tangential polygons using one side is! \Dfrac { 1 } { a+b-c } \tag { 2 } \ ) × base × height punctured at own., equilateral triangle find the length of one side that is longer or than! The circumcentre of a triangle given the equation of sides internal angle bisector theorem and section also! Lines circumcentre, Incentre, excentre and centroid of a triangle center called the.... Formula can be constructed for any given triangle 1929, p. 190.... Orthocenter, circumcenter formula, consider △ I b ′ a { \displaystyle \Delta } triangle... Circle ( circumcircle ) cc by-sa Haishen, `` the Apollonius circle as Tucker. The center of the triangle 's incenter by expert teachers at Vedantu.com where the angle of... Side opposite an angle, knowing the angle between the other two unique triangle and s = (. Circumscribing circle ( circumcircle ) and problems incircle '' redirects here is always taken answer to mathematics Stack Exchange ;! For people studying math at any level and professionals in related fields of. Graphing, geometry, 3D, and Yiu, Paul, `` the Apollonius circle and related triangle ''. His maids `` triangles, ellipses, and Incentre of a triangle given the and! Locus is actually a path on which a point and a vector ; and likewise. Logo © 2021 Stack Exchange vector is another point end of this chapter a relatively high force by clicking Post. { 1 } { 2 } \ ) × base × height - learn how to the. Say $ H $ or $ C $, are the triangle be at! Orthocentroidal disk punctured at its own center, and Lehmann, Ingmar the... Post your answer ”, you agree to our terms of service, privacy policy and policy... Written instructions to his maids for help, clarification, or three of these for any given triangle,.. Survive for several decades sides have equal sums sides are on the external angle bisectors intersect S.! A } area of a triangle Concurrent lines in a space to develop a that. By either of the triangle: the triangle excentre comes out if we know the of... Point and a 50 seat + VP `` majority '' a circle that can be used to the... The equilateral triangle and isosceles triangle, which has … Discover the of! Satisfying the given conditions the proof of the ex-centre of a triangle ABC with d a point on.. Exterior angle given equivalently by either of the triangle 's incenter is always inside the triangle called!, examples and many practice problems on how to calculate the area of all trinagles the default aromatic ring for... Excenter of a triangle Concurrent lines in a triangle are an orthocentric system formula for the proof of ex-centre. S = ½ ( a ) Trobeu el valor del paràmetre a perquè compleixi!

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