Question

f the area of an equilateral triangle is 81v3 cm, find its side.

​

Answer 1

Answer:

Area of an equilateral ∆ = 81√3cm^2

Therefore,

$\frac{ \sqrt{3} }{4} {a}^{2} = 81 \sqrt{3}$

${a}^{2} = 81 \times 4 \\ a = 18$

Perimeter of an equilateral ∆ = 3a = 3×18 = 54 cm