Well, to find the answer, you first have to set up an equation: 180(n-2), n representing the number of sides. since there are 7 sides this is what the equation will look like: 180(7-2) = 900. So the sum of the interior angles is 900 degrees.
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The sum of the interior angles of a n-sided polygon is (n-2)*180 degrees. This is true whether or not the polygon is regular.
A 6 sided polygon is called a Hexagon. The sum of the interior angles or a regular hexagon is 720 degrees.
The interior angles of an x-sided polygon would be: (x - 2) * 180. (20 - 2) * 180 = 3,240
A regular polygon with 17 sides has exterior angles that add up to 360. That is the sum of the exterior angles no matter how many sides a regular polygon has. The sum of the interior angles is (n-2) 180 degrees where n is the number of sides. In this case that is 15x180 which is 2,700
(54-2)*180 = 9360 degrees