Question

in an isosceles triangle, if the measure of a base angle is 74∘, what is the measure of the vertex angle?

Answer 1

32°

Explanation:

An isosceles triangle has 2 congruent base angles, both 74° , then

vertex angle = 180° - (74 + 74)° = 180° - 148° = 32°

Answer 2

the measure of vertex angle is 32°