![]() Ideally, the name of this criterion should then be the AAA(Angle-Angle-Angle) criterion, but we call it as AA criterion because we need only two pairs of angles to be equal - the third pair will then automatically be equal by the angle sum property of triangles.Ĭonsider the following figure, in which ΔABC and ΔDEF are equi-angular,i.e., In short, equiangular triangles are similar. The AA criterion for triangle similarity states that if the three angles of one triangle are respectively equal to the three angles of the other, then the two triangles will be similar. Let us understand the similarity of triangles with the three theorems according to their angles and sides.
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