Each of the 2 equ

Let third side of an isosceles triangle be x. then, two other equal sides are twice.

So, both equal sides are 2x and 2x.

We know that, perimeter of a triangle is sum of all sides of the triangle.

According to the question,

x + 2x + 2x = 30

⇒ 5x = 30

On dividing both sides by 5, we get

⇒

⇒ x = 6cm

∴ Third side = x = 6cm

So, the other equal sides are 2x = 2 × 6 = 12cm and 12 cm.