Question

An equilateral triangle has its side of $3\sqrt{3}cm$, then radius of its circum-circle is :

• A. $3cm$
• B. $4cm$
• C. $2\sqrt{3}cm$
• D. $2cm$

Answer 1

The correct option is A $3cm$

Circumradius of equilateral triangle
$=\frac{a}{\sqrt{3}}$ where, $a$ is the side of equilateral triangle
$=\frac{3\sqrt{3}}{3}=3cm$.