Prove Triangles Similar by AA. 6.4. Another Postulate. All you need are any 2 congruent angles for 2 triangles to be similar. Why only 2 angles?. We know that the sum of the interior angles has to be 180. Therefore, the third angle also has to be congruent.
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All you need are any 2 congruent angles for 2 triangles to be similar.