Question

Find the area of an equilateral triangle of side 10 cm.

• A. $18\sqrt{3}c{m}^2$
• B. $25\sqrt{3}c{m}^2$
• C. $12\sqrt{3}c{m}^2$
• D. $27\sqrt{3}c{m}^2$

Answer 1

The correct option is B

$25\sqrt{3}c{m}^2$

Area of equilateral triangle = $\frac{\sqrt{3}}{4}$ $sid{e}^2$

$=\frac{\sqrt{3}}{4}{10}^2$

$=25\sqrt{3}c{m}^2$