Question

Find the area of equilateral triangle each of whose sides measures 20 cm.

• A. 173$c{m}^2$
• B. 150$c{m}^2$
• C. 120$c{m}^2$
• D. 153$c{m}^2$

Answer 1

The correct option is A 173$c{m}^2$

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

where b is the Side of the Triangle.

Area=$\frac{\sqrt{3}\times {20}^2}{4}$

Area=$173.2c{m}^2$