Question

Two sideaof a triangle are 12 cm and 14 cm . The perimeter of 5he triangle is 36 cm . What is the length of the third side?

Answer 1

Answer:

First side = 12cm

Second side = 14cm

Third side = x

Perimeter = 36cm

12 + 14 + x = 36

26 + x = 36

x = 36 - 26

x = 10

The length of the third side of the triangle is 10cm.

Answer 2

• Let the unknown side be x

Perimeter of A triangle = Sum of all Sides

⇒ Perimeter of A triangle = 12 cm + 14 cm + x

⇒ Perimeter of A triangle = 26 cm + x

⇒ 36 cm = 26 cm + x

⇒ 36 cm - 26 cm =  x

⇒ 10 cm =  x

⇒ x = 10 cm