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17 January, 01:52

What happens to the circumference of a circle if the radius is doubled

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  1. 17 January, 04:22
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    Let radius be r initially

    so circumference initially = 2rpi

    when r is doubled,

    radius = 2r

    so circumference in the end = 4rpi

    how many folds of increase? = 4rpi/2rpi=2 times increase
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