Finding the Radius Or Diameter of a Circle with known Area

Q. Find the diameter of a circle if its area is $49\pi {\text{cm}}^2.$
cm

Q. If the area of the below shape is $18\pi {\text{cm}}^2,$ then the value of $r$ is cm

Q. Find the radius of a circular table if its area is $81\pi {\text{cm}}^2.$

1. $3$ cm
2. $6$ cm
3. $12$ cm
4. $9$ cm

Q.

Work with a partner. Find the radius of circle.

Q. If the area of a circle is $\pi {\text{m}}^2,$ then its:

1. $\text{radius = 1 m}$
2. $\text{diameter = 1 m}$
3. $\text{perimeter =}\pi \text{m}$
4. $\text{perimeter =}2\pi \text{m}$