Question

two sides of the triangle are 8 centimetre and 11cm and perimeter of a triangle is 32 centimetre find the length of the third side​

Answer 1

32-(8+11) ~because the perimeter means sum of all sides of a triangle .

32-19

13 is the length of the third side .

Answer 2

$\sf{\underline{Answer:}}$

The length of the third side of a triangle is 13 cm.

$\sf{\underline{Given:}}$

Perimeter = 32 cm

First side of a triangle = 8 cm

Second side of a triangle = 11 cm

Third side of a triangle = ?

$\sf{\underline{Now:}}$

Let third side of a triangle be x.

$\sf{\underline{We\:know\:that:}}$

$\boxed{\sf{Perimeter\:of\:triangle = Sum\:of\:all\:sides}}$

Substituting the above values in this formula,

$\sf{\underline{We\:get:}}$

$\sf{32 = 8 + 11 + x}$

$\sf{32 = 19 + x}$

$\sf{32 - 19 = x}$

$\sf{13 = x}$

$\sf{\underline{Therefore:}}$

$\boxed{\sf{x = 13\:cm}}$

$\sf{\underline{So:}}$

The length of the third side of a triangle is 13 cm.