The sum of the interior angles of a polygon is equal to 2160, so how many sides does the polygon have？, 15, 18, 12, 14, The sum of the interior angles of a polygon is equal to 1620, so how many sides does the polygon have？, 11, 13, 9, 8, What is the sum of the interior angles of a polygon with 10 sides?, 1520, 2160, 1440, 2260, A regular polygon, it has 12 sides,so how many degrees of it's each angles?, 120, 125, 160, 150, How many diagonals are there in Dodecagon？, 56, 54, 62, 50

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