Question

find the area of an equilateral triangle of side 6 cm.

Answer 1

Area of equilateral triangle
=
$\frac{ \sqrt{3} }{4} \times {(side)}^{2} \\ = \frac{ \sqrt{3} }{4} \times {6}^{2} \\ = \frac{ \sqrt{3} }{4} \times 36 \\ = 9 \sqrt{3}$