Question

The circumference of a circle is 22 cm. Find its area.

Answer 1

Let r cm be the radius of the circle.

Now,

Circumference of the circle:

`2pi"r" = 22`

`rArr 2 xx 22/7 xx r=22`

`=>"r" = (22xx7/44) "cm"`

`=> "r" = 7/2`

Also,

Area of the circle = πr²

^{`= (22/7xx7/2xx7/2) "cm"^2`}

`= 77/2 " cm"^2`

= 38.5 cm²