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Interior degrees add up to 1080 degrees Exterior degrees add up to 360 degrees
A 9 sided polygon is a nonagon Its exterior angles add up to 360 degrees Its interior angles add up to 1260 degrees --------------------------------------------------------- Also the sides of a nine sided figure can not be sold separately.
A pentagon is a 5 sided polygon
7 vertices.
A six sided figure is an hexagon and its interior angles add up to 720 degrees while its exterior angles add up to 360 degrees.