The sum of the interior angles of a 17 sided polygon add up to 2700 degrees.
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(17-2) x 180° = 2700°
You can see this by realizing that you can divide the polygon into 15 triangles by drawing lines from from a single vertex to each of the other vertices - and each triangle will have an interior sum of 180°. The lines to the vertices adjacent to the chosen vertex will be superimposed onto the existing sides,and thus you only wind up with 15 triangles.
The sum of the interior angles of a four-sided polygon is 360 degrees.
The sum of the interior angles of a 12 sided polygon add up to 1800 degrees.
The sum of the interior angles of an n-sided polygon is 180n - 360 degrees.
the interior angle of a 7 sided regular polygon is 128.57 degrees
1980