Question

Triangle ABC is an isosceles right triangle. What is the measure of one base angle?

Answer 1

45°

Explanation:

ΔABC is an isosceles right triangle. So, one angle is 90°

In an isosceles triangle, base angles are congruent.

Let the base angles be x ,x

x + x +90 = 180 {Angle sum property}

2x + 90 = 180

2x = 180 - 90

2x = 90

x = 90/2

x = 45

Base angle = 45°