Heres a good trick to figuring out the sum of the angles of an "n" sided polygon.
It's common knowledge that a triangle (3 sides) has a sum of 180 degrees and a square (4 sides) is 360 degrees. You can infer that a pentagon (5 sides) has a sum of 540 degrees. So the equation to figure out the sum of all the angles of an "n" sided polygon is 180*(n-2). So in your case n = 17 so the equation becomes 180(17-2) = 2700 degrees
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The sum of the interior angles of a 14 sided polygon are 2160 degrees.
3240
2160 degrees
The interior angles of a 14 sided polygon add up to 2160 degrees
The sum of the interior angles of a convex polygon with n sides is given by (n-2)x180o. So for a 40 sided polygon n=40; thus (40-2)x180o = 38x180o = 6840o.