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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 Pi = 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

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:  A = cm2

RESULTS BOX:


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

RESULTS BOX:


9. If the radius of a circle is 1.5 inches, then what is the circumference?
ANSWER BOX:  C = 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:  A = cm2

RESULTS BOX:



Circumference & Area Lessons
Geometry and the Circle
Circumference of a Circle
Area of a Circle
Practice Exercises
Challenge Exercises
Solutions

Related Activities
Circle Crosswords
Circle Solver
Circumference and String
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