Question

Radius of circle is $7\text{cm}.$ Find perimeter and area of the circle.

Answer 1

For a circle of radius $r$ its perimeter and area are defined as $2\pi r$ and $\pi r^2.$

The radius of circle $r=7\text{cm}.$

Perimeter of circle is,

$\text{Perimeter}=2\pi r$

$=2\times \frac{22}{7}\times 7$

$=44\text{cm}$

Area of cirlce is,

$\text{Area}=\pi r^2$

$=\frac{22}{7}\times 7\times 7$

$=154{\text{cm}}^2$