Question

How do you find the radius of a circle with an area of 90 cm 2?

Answer 1

See below for approach...

Explanation:

The area of a circle is `pi r^2`

`=> pi r^2 = 90`

`=> r^2 = 90/pi`

`=> sqrt ( r^2 ) = sqrt( 90/pi)`

`=> r = sqrt( 90/pi) cm`

`=> r approx 5.3524 cm`