Question

the perimeter of an isosceles triangle is 20cm. If one of the two equal sides is 6cm, then the third size is

Answer 1

the value of third side is 8

Answer 2

Isosceles triangle has two equal sides.

One of the two equal sides is 6cm so another equal side also = 6cm

First side = 6cm
Second side = 6cm
Let third side be x

Perimeter of Isosceles triangle = 20 cm

sum of all sides = 20
6+6+x = 20
12+x = 20
x = 20 - 12
x = 8

Third side = 8cm