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? ANSWER BOX:   =  mm   RESULTS BOX:

2.	If the radius of a circle is 15.3 centimeters, then what is the diameter? ANSWER BOX:   =  cm   RESULTS BOX:

3.	Find the circumference of a circle with a diameter of 11 millimeters. ANSWER BOX:   =  mm   RESULTS BOX:

4.	Find the circumference of a circle with a diameter of 7.5 inches. ANSWER BOX:   =  in   RESULTS BOX:

5.	Find the diameter of a circle with a circumference of 21.98 meters. ANSWER BOX:   =  m   RESULTS BOX:

6.	Find the area of a circle with a radius of 4 inches. ANSWER BOX:   =  in2   RESULTS BOX:

7.	Find the area of a circle with a radius of 3.5 centimeters. (Do not round.  Enter your answer to three decimal places.) ANSWER BOX:   = cm2   RESULTS BOX:

8.	Find the radius of a circle with an area of 200.96 square feet. ANSWER BOX:   =  ft   RESULTS BOX:

9.	If the radius of a circle is 1.5 inches, then what is the circumference? ANSWER BOX:   =  in   RESULTS BOX:

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.) ANSWER BOX:   =  cm2   RESULTS BOX: