Question

find the area of equilateral triangle whose each side is 1)12 cm 2)5cm.

Answer 1

use formula
area of equilatral triangle=root3/4 (side length)^2

now
1) area of triangle=root3/4 (12)^2=36root3 cm^2

2) area =root3/4 (5)^2=25root3/4 cm^2

Answer 2

1. side=12cm=a
area of equilateral triangle=√3/4×a²
=> √3/4×12×12
=> 36√3 cm²

2. side=5cm=a
area of equilateral triangle=√3/4×a²
=> √3/4×5×5
=> 25√3\4 cm²