For any polygon, do (sides-2)x180 degrees
For an octagon, do (8-2)x180=6x180=960(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 7 interior angles add up to 900 degrees
Interior angles = 1080 degrees Exterior angles = 360 degrees
Exterior angles add up to 360 degrees Interior angles add up to 2520 degrees