Septagon from Latin
Heptagon from Greek
Both mean seven sides
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Septagon or Heptagon = seven sided shape
900° The formula for the sum of the angles of an n-sided figure is (n-2)x180°. For a 7 sided shape this would be (7-2)x180° = 5*180° = 900°
heptagon
A heptagon is a 7 sided polygon.
A 7-sided polygon is called a heptagon.