Question

the perimeter of an equilateral triangle is 24 cm find its area

Answer 1

a=8
Area=(√3a×a)/4
A=27.7

Answer 2

Perimeter of an equilateral triangle: 3xside
24 = 3 x side
side = 24/3 = 8 cm²

Area of an equilateral triangle: $\frac{\sqrt[]{3} a^{2} }{4}$

= $\sqrt{3}$ x $8^{2}$ / 4
= $\sqrt{3}$ x 64/4
= $\sqrt{3}$ 16
or 27.7 (approximately)

Hope that helped! :)