The lengths of the base and one leg are given. What is the third side of the triangle called? - Given info below

Question

The length of the base of an isosceles triangle is x. The length of a leg is 2x - 5. The perimeter of the triangle is 20.

1. The lengths of the base and one leg are given. What is the third side of the triangle called?
2. Write an expression for the length of the third side.

Answer 1

The third side is equal to the other side in an isosceles triangle; therefore the third side is 2x -5.

5x - 10 = 20

x = 6

2x -5 = 7