What is the radius of a circle with area 345 square centimetres?

Remember the equation for the area of a circle.

A = pi r^(2)

To find 'r' algebrucally rearrange

r^(2) = A/pi

Do not forget to Square Root BOTH sides

r = sqrt(A/pi)

r = sqrt(345 / 3.141592....) )

r = sqrt(109.8169107....)

r = 10.47935641... cm ~ 10.5 cm