A triangle has a 69° angle and a right angle. What is the measure of the third angle?

Question

A triangle has a 69° angle and a right angle. What is the measure of the third angle?

Answer 1

The total measurement of a triangle is 180 degrees.

You are given 69 degrees and 90 degrees (right angle).

m∠3 = 180 - (m∠1 + m∠2) = 180 - (69 + 90) = 180 - 159 = 21º