Question

the area of equilateral triangle in cm whose side is 8 mm

Answer 1

Area = 4 root4 mm^2 is the area of the equilateral triangle.

Answer 2

Area = a^2 * sqrt(3)/4
= (8 mm)^2 * sqrt(3)/4
= 27.71 mm^2
= 27.71 * (0.1 cm)^2
= 0.2771 cm^2