Question

Explaining How to Find an Angle Measure
A triangle has a 90° angle, and the other two interior angles are congruent. Explain how to find the measure of one of the two congruent angles.

Answer 1

Let each congruent angle be x. The three interior angles sum to 180°, so
90 + x + x = 180.
Thus 2x = 90 and x = 45°.

So each of the congruent angles measures 45°.