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24 February, 07:14

If the diameter of a circle changes from 5cm to 15cm, how will the circumference change

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  1. 24 February, 08:09
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    The circumference will triple.

    C=πd

    For d=5cm, this is C=5π.

    For d=15cm, this is C=15π.

    The second one is 3 times the first one.
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