Janice says that the sum of the measures of the interior angles of an octagon is 900°. Is Janice cor

Discussion in 'Calculator Requests' started by math_celebrity, Jan 8, 2022.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    Janice says that the sum of the measures of the interior angles of an octagon is 900°. Is Janice correct? Why or why not?

    She's incorrect.

    The interior angle sum for a polygon is found with this formula:
    Interior Angle Sum = (sides - 2) x 180°

    Since an octagon has 8 sides, we have:
    Interior Angle Sum = (8 - 2) x 180°
    Interior Angle Sum = 6 x 180°
    Interior Angle sum = 1080°
     

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