540 degrees. you figure it out by seeing how many triangles you can make in the polygon (without crossing lines), and, because triangles equal 180 degrees, you multiply 180 times how many triangles you can make.
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The interior angles of a 7 sided polygon add up to 900 degrees
The exterior angles of a 14 sided polygon add up to 360 degrees
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
An 8 sided polygon is an octagon and has exterior angles that add up to 360 degrees and its interior angles add up to 1080 degrees
The sum of the interior angles of a 12 sided polygon add up to 1800 degrees.