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7 April, 10:28

Find the approximate radius of a sphere with a surface area of 400 square inches.

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  1. 7 April, 10:56
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    The equation for surface area of a sphere is SA=4*pi*r^2

    We can plug in what we know to solve for r

    400=4*pi*r^2

    100=pi*r^2 (divide out the 4)

    100/pi=r^2 (divide out the pi)

    √ (100/pi) = r (square root of both sides)

    r=5.6 rounded to the nearest tenth
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