Question

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

Answer 1

We know that,

$$\begin{gathered} Perimeterofatriangle=sumofallsides \\ 36=12+14+thirdside \\ Thirdside=36-26 \\ Thirdside=10cm \end{gathered}$$

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