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physics

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One afternoon, a couple walks five-eighths of the way around a circular lake, the radius of which is 1.45 km. They start at the west side of the lake and head due south to begin with.

(a) What is the distance they travel?

  • physics -

    distance=radius*5/8*radius*2PI

  • physics -

    delete one of the radius in the above, I got carried away.

  • physics -

    WHAT IS Pl???

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