Question

In an isosceles triangle the vertex angle is twice either base angle.(Let the base angle be b in degrees. Remember that the sum of a triangle is 180 degrees ).

Answer 1

Step-by-step explanation:

let the base angle be b so the vertex angle is 2x

we know 2x+x+x=180°

=>4x=180°

=>x=180/4

=>x=45

so the base angle are 45°,45° and the vertex angle is 2x=2×45=90°