If the diameter of a circle is 40 cm, what is its radius?

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A 20 cm
B 80 cm
C 10 cm
D 30 cm

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Answer: A. 20 cm

The radius goes from the centre to the edge and is half the diameter. So radius = 40 / 2 = 20 cm. Doubling to get 80 cm is the common mistake.

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If the diameter of a circle is 40 cm, what is its radius?

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