Practice Exercises: Circumference and Area

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 pi.gif = 3.14 to calculate your answers.

1. If the diameter of a circle is 142.8 millimeters, then what is the radius?
ANSWER BOX:  r =  mm  

RESULTS BOX: 

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

RESULTS BOX: 

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

RESULTS BOX: 

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

RESULTS BOX: 

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

RESULTS BOX: 

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

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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:  A = cm2  

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

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

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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:  A =  cm2  

RESULTS BOX: