Question

Two sides of a triangle are $12cm$ and $14cm$. The perimeter of the triangle is $36cm$. What is the third side?

Answer 1

Given sides of triangle are $12cm$ and $14cm$.

Assume third side = $xcm$

Perimeter of triangle = sum of all sides

= $xcm+12cm+14cm$

= $x+26cm$

Therefore ,

$$\begin{gathered} x+26=36 \\ x=36-26 \\ =10cm \end{gathered}$$

Hence, the third side of triangle is $10cm$.