Question

In an isosceles triangle, the vertex angle is twice either base angle. Then, find the measure of base angle.​

Answer 1

45°

Explanation:

let the base angle be x, then vertex angle = 2x

The sum of the 3 angles in a triangle = 180°, thus

x + x + 2x = 180

4x = 180 ( divide both sides by 4 )

x = 45

The base angle = 45°