Question

Find the radius and diameter of circular whose circumference is $440cm.$

Answer 1

Let $r$ be the radius of circle.

As we know that,

Circumference of circle $=2\pi r=440cm\left(\text{Given}\right)$

$\Rightarrow 2\frac{22}{7}r=440$

$\Rightarrow r=\frac{440\times 7}{22\times 2}=10\times 7=70cm$

Also,

Diameter of circle $=2r=2\times 70=140cm$