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4 April, 17:34

A circular path 2feet wide has an inner diameter of 150 feet. How much farther is it around the outer edge of the path than around the inner edge?

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  1. 4 April, 19:39
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    The circumference of any circle is

    diameter x pi.

    Distance around the outside of the walk is (150+2+2) pi = 154 pi feet.

    Distance around the inside of the walk is 150 pi feet.

    Difference = 4 pi feet.

    Same as if you strung a string around the Earth that was 2 feet off the surface everywhere.

    The string would be 4pi feet longer than the Earth's circumference at the surface ... about 12.5 feet.
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