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23 March, 23:18

The radius of a circle is doubled. How does the area change?

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  1. 23 March, 23:38
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    Area increases by a factor of 4

    Step-by-step explanation:

    The area (A) of a circle is calculated as

    A = πr²

    If the radius is doubled, that is r = 2r, then

    A = π (2r) ² = 4πr²

    Hence the area has been increased by a factor of 4
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