Question

The area of the equilateral triangle is $20\sqrt{3}c{m}^2$ whose each side is

• A. $8cm$
• B. $4\sqrt{5}cm$
• C. $4cm$
• D. $5\sqrt{3}cm$

Answer 1

Answer: (B)

$4\sqrt{5}cm$

Area of the triangle $=20\sqrt{3}=\frac{\sqrt{3}{a}^2}{4}$
$\therefore a^2=80\Rightarrow a=\sqrt{80}=a=4\sqrt{5}cm$