Question

find the area of an equilateral triangle whose perimeter is 60 CM

Answer 1

Perimeter of an equilateral triangle=3×side
=> side = 20

Area of an equilateral triangle
=[ root (3) ×side^2] ÷ 4
=[Root 3 × 20 ×20] ÷4
=100×root3 cm^2

Hope it helps

Answer 2

Hey!

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