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A seven sided shape is called a heptagon. A polygon is named by the number of sides it has using a prefix that denotes the specific number; hence pentagon (5 sides), hexagon (6 sides
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A seven sided shape is known as a "heptagon" if it is two dimensional. If the seven sided shape is three dimensional, then it is called a "heptahedron."
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A heptegon or a septegon.
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A heptagon is the shape that has seven sides. All sides and all angles are equal. This is a very uncommon shape, the octagon and hexagon are a little more popular.
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