Question

find the unknown angles a,b when b=2a-15

Answer 1

when two variable are to be find and one equation given then there is only method either hit ND trial or equate

Answer 2

Answer:

Step-by-step explanation:

A triangle with the two equal side is an isoceles triangle.

In isoceles triangle two angles are equal

As give Angle A is 80°

And as we know A+B+C=180→ B+C=180–80

As angle B and C are equal

2B=100→ Angle B =50° ans.