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9 September, 12:53

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

784 in2

2,463 in2

998 in2

250 in2

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  1. 9 September, 15:08
    0
    Hi there,

    Using Surface Area = 4 x pi x r^2

    Circumference = 2 x pi x r

    28 = 2 x pi x r

    28/2 x pi = r

    radius = 4.5ins

    Surface Area = 4 x pi x 4.5^2

    Surface Area = 254.5 ins^2

    Surface Area = 255 ins^2 (to nearest square inch)
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