The AA postulate in Euclidean geometry states that two triangles are similar if they have two corresponding angles congruent. The AA postulate works because the interior angles of a triangle are always equal to 180°. By knowing two angles, such as 32° and 64° degrees, we know that the next angle is 84°, because 180-(32+64)=84. (This is sometim...

Found on http://en.wikipedia.org/wiki/AA_postulate

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