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Math homework help? please ?

by Guest32151  |  earlier

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How many revolutions will a ciricular disk with a diameter of 4 feet have completed after id has rolled 20 feet?

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  1. The circumference of the disk is 2pi x radius, or diameter x pi.

    Diameter x pi = 4 x 3.14159 = 12.57 feet, or one revolution.

    20 feet divided by 12.57 feet = revolutions the disk has turned.

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