Question

The ratio between base angle and
the vertex angle of an isosceles triangle is 3:4 . Find its angle.

Answer 1

base angle is 67.5
vertex angle is 90.
remains angle is 22.5

Answer 2

so the angles be 3x and 4x so its a isosceles triangle so another angle will be 3x
⇒ 3x +4x + 3x = 180 
⇒x = 18 
so the base angles are 54, 54 and vertex angle is 72.