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31 October, 02:44

A balloon has a circumference of 28 in. Use the circumference to approximate the surface area of the balloon to the nearest square inch.

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  1. 31 October, 03:12
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    Okay so use the surface area = 4x pi x r^2

    circumference = 2x pi x r

    28 = 2x pi x r

    28/2x pi = r

    radius = 4.5 ins

    surface area = 4x pi x 4.5^2

    surface area = 254.5 ins^2

    surface area = 255 ins^2 (to the nearest square inch)
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