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Area and circumference of circles

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  • Calculate the area of this shape
    28.3cm^2
  • Calculate the area of this shape
    50.3 cm^2
  • What is the radius of a circle when the diameter is 18 inches?
    9 inches
  • What is the approximate value often used for pi?
    3.14
  • The Jeep spare tire cover has a radius of 16 inches. What is the circumference of the cover?
    100.53 inches
  • Calculate the circumference of this shape
    22.0cm
  • The diameter of the window is 5 feet. What is its area?
    19.634 ft^2
  • What is the formula for finding the area of a circle?
    πr^2
  • Calculate the circumference of this shape
    31.4cm
  • What's the formula for finding the circumference of a circle?
    πd or 2πr
  • Calculate the area of this shape
    78.5 cm^2
  • Calculate the circumference of this shape
    18.8cm
  • Calculate the area and circumference of this shape
    A= 63.5cm^2 and C= 28.3cm
  • Calculate the area and circumference of this shape
    A= 50.3 cm^2 and C = 25.1 cm