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26 January, 11:53

If one exterior angle in a regular polygon is 120°, then what kind of polygon is it?

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  1. 26 January, 15:28
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    interior angle = 180-exterior = 180-120 = 60°

    using

    [ (n-2) 180]:n = 60

    (n-2) 180 = 60n

    180n - 360 = 60n

    180n - 60n = 360

    120n = 360

    n = 360:120 = 3

    it's a triangle
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