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17 December, 13:19

If the diameter of a circle changes from 5 cm to 15 cm, how will the circumference change? A) multiplies by 1 3 B) multiplies by 3 C) increases by 10 D) decreases by 10

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  1. 17 December, 14:34
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    The length of a circumference: l=πD

    l₁=π*5=5π

    l₂=π*15=15π

    Then l₂:l₁=15π:5π=3 and the answer is B)
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