Question

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

Answer 1

Let the length of third side be $x$ $cm$.
Length of other two side are $12$ $cm$ and $14$ $cm$.
Now, Perimeter of triangle = $36$ $cm$
$\Rightarrow 12+14+ x = 36$
$\Rightarrow 26+x = 36$
$\Rightarrow x = 36-26$
$\Rightarrow x = 10$ $cm$

Thus, the length of third side is $10 \;cm$.