Question

The circumference of a circle is $440cm$. Find its radius and diameter $(\text{Take}\pi =\frac{22}{7})$.

Answer 1

Given:

The circumference of circle $=440cm$.

We know that, circumference of circle $=2\pi r$.

Where,

$r=$ radius of circle.

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

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

$\Rightarrow r=70cm$

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

Hence, radius of circle $=70cm$ and
diameter $=140cm$.