Question

Find the area of equilateral triangle (in $c{m}^2$)each of whose sides measure 18 cm.

• A. 150
• B. 140
• C. 180
• D. 190

Answer 1

The correct option is B 140

Area of Equilateral Triangle =$\frac{\sqrt{3}{a}^2}{4}$

where $a$ is the Side of the Triangle.

Given $a=18cm$

Area $=\frac{\sqrt{3}\times {18}^2}{4}$

Area $=140.29c{m}^2$