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4 August, 19:22

If the sum of the interior angles of a polygon is 1,440°, then the polygon must be

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  1. 4 August, 19:26
    0
    Decagon

    Step-by-step explanation:

    (2-4) 90=1440

    180-360=1440

    180=1440+360

    n=1800:180

    n=10
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