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Math (geometry)

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How do I find the radius of a regular nonagon with an apothem of length 6.42in.

  • Math (geometry) - ,

    There are 9 40° angles in a circle, so the nonagon consists of 9 isosceles triangles, having angles of 40,70,70.

    The radius is r, where
    6.42/r = cos20°

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