Year 9 Circumference of Circles

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Formula used to measure circumference of circle is

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2πd

πr²

πr² + 2r

2πr

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What is the circumference of a circle with a diameter of 12 cm? (answer to the nearest cm)

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37 cm

6 cm

38 cm

24 cm

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What is the radius of a circle with a diameter of 20 cm?

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10 cm

40 cm

60 cm

30 cm

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What is the circumference of a circle with a radius of 12 m?

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75 cm

37 cm

76 cm

38 cm

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What is the diameter of a circle with a radius of 11 metres?

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5.5 m

22 m

121 m

33 m

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Is the diameter of a tyre less than, greater than, or equal to its circumference?

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less than

greater than

equal to

not enough information

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Which is true about the radius and diameter?

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The diameter is two times the size of the radius.

The radius is two times the size of the diameter

The radius and diameter can sometimes be equal

The diameter is half the size of the radius

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As a rough guide, the circumference of a circle is about ____ times its diameter.

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two

ten

three

four

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The circumference of a circle can also be called its _____.

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area

perimeter

height

length

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A circle with a radius of 5 cm will have a diameter of:

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31.42 cm

10 cm

2.5 cm

15.71 cm

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Calculate the circumference of this circle

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50.3 m

201.1 m

100.5 m

25.1 m

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A circle has a circumference of 32.4 mm.Find the radius and the diameter. Round your answers to two decimal places.

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5.16 mm; 10.31 mm

5.16 mm; 2.58 mm

10.31 mm; 5.16 mm

2.58 mm; 5.16 mm

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If the radius of a circle is doubled, then its circumference:

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is halved

stays the same

is doubled

becomes four times as much

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If the length of the shorter arc AB is 22 cm and C is the centre of the circle then the circumference of the circle is

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990 cm

67 cm

176 cm

88 cm

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What is the circumference of the circle?

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12.56 units

25.12 units

50.24 units

251.2 units

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