Question

The length of each side of equilateral triangle having an area of 9cm*2(square)

Answer 1

Area of equilateral triangle = ✓3/4a² [ where a is side of equilateral triangle]

9 = ✓3/4 × a

9×4/✓3 = a

a = 36/✓3 = 20.78 cm.

Therefore,

sides of equilateral triangle = 20.78 cm

Answer 2

formulae of equilateral ∆= ✓3/4*s²
=✓3/4*s²=9cm²
=4.56cm