Question

The perimeter of an Isosceles triangle is 42cm. If its equal sides length is 12cm. Find its third sides ?

Answer 1

Answer:

18 cm

Step-by-step explanation:

Two Equal sides = 12+12 = 24 cm

Third Side = Perimeter - length of two sides

= 42 - 24

= 18 cm

The Third side length is 18 cm.

Hence Proved!

Answer 2

Given that:

• The perimeter of an isosceles triangle is 42 cm.
• One of its equal sides 12 cm.

To Find:

• The third side.

Let us assume:

• The third side of isosceles triangle be x.

Formula used:

• Perimeter of an isosceles triangle = 2(Equal sides) + Third side

According to the question.

ㅤ↠ㅤ42 = 2(12) + x

ㅤ↠ㅤ42 = 24 + x

ㅤ↠ㅤx = 42 - 24

ㅤ↠ㅤx = 18

Hence,

• The third side of isosceles triangle is 18 cm.