If 2 angles are congruent and complementary, they must each be 45 degrees.
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If they are congruent, they have the same measure. If they are complementary, their sum is 90 degrees. So each one of them must be a half of 90 degrees. That is, 45 degrees each.
Draw to lines intersecting each other. The angles across from each other will be both congruent and adjacent
A triangle with all angles congruent are called equilateral. Each angle is 60 degrees.
Yes, equilateral triangles have congruent interior angles, and each of the three interior angles measures 60 degrees.
Yes, a square has 4 right angles, which each equal 90 degrees, so they are congruent.