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11 November, 22:01

Which polygon has an interior angle sum of 1260°? A polygon has 7 sides. A polygon has 8 sides. A polygon has 9 sides. A polygon has 10 sides.

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Answers (2)
  1. 11 November, 22:53
    0
    9 sides

    Step-by-step explanation:

    The sum of the interior angles of a polygon is

    sum = 180° (n - 2) ← n is the number of sides

    Equating to 1260 gives

    180° (n - 2) = 1260 (divide both sides by 180)

    n - 2 = 7 (add 2 to both sides)

    n = 9

    Thus a polygon with 9 sides
  2. 11 November, 23:43
    0
    the answer is c
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