Year 8 Circumference of Circles

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The feature shown on this circle is

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circumference

diameter

arc

radius

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Which is true about the radius and diameter?

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The diameter is half the size of the radius

The radius and diameter can sometimes be equal

The diameter is two times the size of the radius

The radius is two times the size of the diameter

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The formula for finding the circumference of a circle is

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c = πr

c = 2πd

c = 2πr

c = 2πr²

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Find the circumference of the circle shown below

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75.4 cm

24 cm

37.7 cm

452.4 cm

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A circle with a radius of 10 cm will have a circumference of approximately:

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5 cm

62·83 cm

31·42 cm

20 cm

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Calculate the circumference of a circle correct to 1 decimal place if the radius is 12.05 cm

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44.1 cm

78.5 cm

37.9 cm

75.7 cm

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Calculate the circumference of a circle correct to 1 decimal place if the diameter is 4.8 cm

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15.1 cm

30.2 cm

7.6 cm

21.3 cm

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The circumference of a circle is 477.5 cm. Calculate its radius to the nearest whole number.

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70 cm

76 cm

82 cm

85 cm

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Ted’s bicycle wheel has a diameter of 700 mm.
Approximately how far does his bicycle travel when the wheel makes 10 revolutions?

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2 m

7 m

20 m

44 m

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The diameter of circle X is 15 centimetres. The diameter of circle Y is 20 centimetres. Which measurement is closest to the difference between the circumference of circle X and the circumference of circle Y in centimetres?

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15.7 cm

7.85 cm

137 cm

31.4 cm

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