Question

Find the area of an equilateral triangle whose perimeter is 60 cm

Answer 1

Perimeter of an equilateral triangle = 60 cm

Side of an equilateral triangle = 60/3 = 20cm

Area of equilateral triangle = √3 / 4 x (side)^2
= √3 / 4 x 20 x 20
= 100√3
= 100 x 1.732
= 173.2 cm^2