Question

find the perimeter of the triangle whose sides are equal and measure 7 cm each

Answer 1

Perimeter of equilateral triangle = 3 × side

= 3× 7 = 21 cm

Answer 2

If side is 7cm each,it shows that it is an equilateral triangle

$perimeter \: of \: equilateral \: triangle \: = side \times 3$
Side = 7

7*3= 21cm