Question

In a triangle, the perimeter is $60$ cm and the length of two sides of triangle are $13$ cm and $20$ cm. Find the length of the third side.

Answer 1

Perimeter $=$ sum of all lengths of sides of triangle.

Let third side be x.

$\Rightarrow 13+20+x=60$

$\Rightarrow x=40-13=27$cm.