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10 July, 05:16

What is the radius of a sphere which area is equal to the sum of the areas of four circles of radius 7?

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  1. 10 July, 08:52
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    radius = 7 units

    Step-by-step explanation:

    Given:

    Radius = 7 units

    Find area of 4 circles:

    1 circle = π (7) ² = 49π units²

    4 circles = 49π x 4 = 196π units²

    Find radius of sphere:

    4πr² = 196π

    r² = 49

    r = 7
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