Question

if the area of a equilateral triangle is 81√3cm^2 find the length of its side

Answer 1

let length of the side = a cm

area =81 root3 cm^2[given]

root3/4*a^2=81*root3

a^2 = 81*root3* 4/root3

a^2 =81*4
a^2 =(18)^2
a=18 cm
side = a = 18cm