Question

In an isosceles triangle the base angles are equal and the vertex angle is twice of each base angle

Answer 1

let one base angle be x
so the vertex be 2x. (a. t. q)
the sum of all angle of the triangle = x+x+2x=4x'

Answer 2

Suppose base angle be x.
So vertex angle=2x
Now x+x+2x=180
or,4x=180
or, x=180/4=45
So two base angles are 45 & 45
And also vertex angle is 90.