Year 9 Area of Circles

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The distance from one side of a circle to the other is called the

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radius

diameter

circumference

area

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Formula used to measure area of circle is

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4πr²

πr²

2πr²

πr² + 2r

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The area of the circle would be found using which of the following formulas...

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Area = π(4.5)²

Area = π(9)²

Area = π(18)²

Area = π(81)²

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A circular clock face has a diameter of 31 cm. What is the area of the clock face? (Give the answer to one decimal place).

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754.7 cm²

3019.1 cm²

48.7 cm²

97.4 cm²

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Find the area of this circle. Give the answer to the nearest square millimetre. (Give the answer to 2 decimal places).

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201.06 cm²

25.13 cm²

804.25 cm²

50.27 cm²

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The area of the circle is 154 cm². The radius of the circle is closest to

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7 cm

14 cm

3.5 cm

17.5 cm

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The area of the circle whose diameter is 21 cm is

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346.4 cm²

37.7 cm²

18.8 cm²

19.8 cm²

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