Practice Exercises: Circumference and Area
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.) |