Question

Find the perimeter of :
(a) a scalene triangle with sides $7$ cm, $8$ cm and $9$ cm
(b) an equilateral triangle of side $2.4$ m
(c) an isosceles triangle with equal sides of $12$ cm each and the third side $9$ cm.

Answer 1

We know perimeter of any triangle is the sum of lengths of its sider.

a) length of sides are $7cm,8cm$, and $9cm$

perimeter $=(7+8+9)cm$

$=24cm$

b) Triangle is equilateral with one side as $2.4m$

perimeter $=(2.4+2.4+2.4)m$

$=7.2m$

c) equal side are of $12cm$ and other is of $9cm$

perimeter $=(12+12+9)cm$

$=33cm$