Question

Find the

Answer 1

Answer:

54 cm

Step-by-step explanation:

The area (A) of an equilateral triangle is

A = $\frac{s^2\sqrt{3} }{4}$  ( s is the side length ) then

$\frac{s^2\sqrt{3} }{4}$ = 81$\sqrt{3}$ ( multiply both sides by 4 to clear the fraction )

s²$\sqrt{3}$ = 324$\sqrt{3}$ ( divide both sides by $\sqrt{3}$ )

s² = 324 ( take the square root of both sides )

s = $\sqrt{324}$ = 18

Thus

perimeter = 3 × 18 = 54 cm