Question

find the perimeter of an equilateral triangle whose side is 9 cm​

Answer 1

perimeter = sum of all sides

9+9+9

= 27cm

Answer 2

$\huge\underline\mathcal\green{Answer}$

Given:

Side of equilateral triangle = 9 cm

Perimeter = ?

As we know that ...

perimeter of equilateral triangle = 3a

= 3 × 9

= 27 cm