In geometry, a heptagon is a polygon with seven sides and seven angles.
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A seven sided figure is called a heptagon.
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
A four sided figure is called a quadrilateral.
A 12-sided figure is called a dodecagon.
There are 900 degrees in a seven sided figure!!