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March 24, 2017

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The measure of an interior angle of a regular n-gon is 140 degree. How many sides are in the regular polygon?

  • geometry - ,

    let the number of sides be n

    180(n-2)/n = 140
    180n - 360 = 140n
    40n = 360
    n = 9

    9-sided regular polygon, a nonagon

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