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Math Help - area of a lune

  1. #1
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    area of a lune

    Can't search on the net what really is a lune.

    "What is the area in square cm. of a lune whose angle is 80 degrees on a sphere of radius 60 cm. ?"
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  2. #2
    MHF Contributor
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    According to Wikipedia, a lune is an area on a sphere bounded by two half great circles.
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