Question

The base angle of an isosceles triangle measures 54°. What is the measure of its vertex angle?
27°
36°
54°
72°

Answer 1

Answer:

the answer is 72°

Step-by-step explanation:

let the vertex angle be x°

since both the base angles of an Isocelus triangle are same

I. e

54 °+54 °+ x° = 180°

on solving we get x°=72 .