Question

the perimeter of an isoseles triangle is 21 cm. find the measure of equal sides given that the third side is 5 cm.

Answer 1

x + x + 5 = 21cm

2x = 16cm

x = 8cm

a = 8cm , b = 8cm , c = 5cm

Answer 2

Let the equal side be x
perimeter of triangle= sum of all side
$x + x + 5 = 21 \\ 2x = 21 - 5 \\ x = \frac{16}{2} \\ x = 8$
so the length of equal side is 8cm