Interior angles = 1080 degrees
Exterior angles = 360 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
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 interior angles of an 11 sided polygon add up to 1620 degrees
The 7 interior angles add up to 900 degrees