Question

A right angle is decomposed into three angles. One angle has a measure of 50°, and the other two angles are equal. What is the measurement of each unknown angle?

45°
40°
25°
20°

Answer 1

20°

Explanation:

A right triangle equals 90°.

So, you can subtract the angle that you already know.

90°

-50°

-----------

40°

Since the other two angles are congruent you can divide 40° into two parts.

40°

÷2

-----------

20°

So, each unknown measurement of the triangle is 20°.