Question

In an isosceles triangle, the base angles are equal. The vertex angle is 40
What are the base angles of the triangle? (Remember, the sum of three angles of
a triangle is 180°).​

Answer 1

Let the base angles be ′x′

Therefore, 

x+x+40∘=180∘                                  [Given]

2x=180∘−40∘

2x=140∘

x=70∘

Answer 2

Step-by-step explanation:

Let base angle is x°

There fore,

x+x+40=180°

2x=180°-40°

2x=140°

x=70°