The 7 interior angles add up to 900 degrees
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The interior angles of a 9 sided nonagon add up to 1260 degrees and its exterior angles add up to 360 degrees
The exterior angle of a 7 sided shape add up to 360 degrees The interior angles of a 7 sided shape add up to 900 degrees
The interior angles of an 11 sided polygon add up to 1620 degrees
A heptagon is a 7 sided polygon whose interior angles add up to 900 degrees.
In total all 4-sided, 2-dimensional shapes angles' add up to 360 degrees. Depending on the length, width and shape of the polygon.