Using the diagram, answer the following questions.

- What is the radius of the circle?
- What is the diameter of the circle?
- What is the circumference of the circle (express answer in terms of pi)?
- What is the circumference of the circle (round answer to nearest hundredth)?
- What is the area of the circle (express answer in terms of pi)?
- What is the area of the circle (round answer to nearest hundredth)?

Click to Reveal Answers.

- What is the radius of the circle? 9
- What is the diameter of the circle? 18
- What is the circumference of the circle (express answer in terms of pi)? 18π
- What is the circumference of the circle (round answer to nearest hundredth)? 56.55
- What is the area of the circle (express answer in terms of pi)? 81π
- What is the area of the circle (round answer to nearest hundredth)? 254.47