Question

Find the radius of circle if its area is $125\pi c{m}^2$

• A. $5\sqrt{5}cm$
• B. $3\sqrt{3}cm$
• C. $2\sqrt{2}cm$
• D. none

Answer 1

The correct option is A $5\sqrt{5}cm$

The area of circle is $125\pi c{m}^2$

The area of circle of radius $r=\pi r^2$

$\therefore 125\pi c{m}^2=\pi r^2$

$r^2=125$

$\Rightarrow r=5\sqrt{5}cm$