
Practice Exercises: Circumference and Area 

Unit 2
> Lessons 4 of 6 
Directions: Read each question below. Click once in an ANSWER BOX and type in your answer; then click ENTER.
After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect.
To start over, click CLEAR. Use = 3.14 to
calculate your answers.

1.

If the diameter of a circle is 142.8 millimeters, then what is the radius?

2.

If the radius of a circle is 15.3 centimeters, then what is the diameter?

3.

Find the circumference of a circle with a diameter of 11 millimeters.

4.

Find the circumference of a circle with a diameter of 7.5 inches.

5.

Find the diameter of a circle with a circumference of 21.98 meters.

6.

Find the area of a circle with a radius of 4 inches.

7.

Find the area of a circle with a radius of 3.5 centimeters. (Do
not round. Enter your answer to three decimal places.)

8.

Find the radius of a circle with an area of 200.96 square feet.

9.

If the radius of a circle is 1.5 inches, then what is the circumference?

10.

If the diameter of a circle is 9 centimeters, then what is the area?
(Do not round. Enter your answer to three decimal places.)

