Question

Solve the following: 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 equal angles be x

x + x + 40 = 180 (angle sum property)

2x + 40 = 180

2x = 140

x = 70