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