Question

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

Answer 1

Let the length of the third side be $x$ cm.

Length of other two sides is $12$ cm and $14$ cm.

Now, Perimeter of triangle = Sum of all sides = $36$ 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.