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Two triangles have two pairs of congruent angles. explain why you do not need to find the measures of the third pair of angles to determine that they are congruent.

User IngoB
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When it is proven that the two pairs of angles are congruent ...the third angle being 180 - the sum of the two angles. It will be the same for both the angles, therefore it is assumed and need not be determined.
User Joel Cross
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