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A heptagon is a shape with seven sides. An octagon has eight sides; a nonagon has nine sides; a decagon has 10 sides; a hendecagon has 11 sides. You can find more information here
http://answers.ask.com/Science/Mathematics/what_sh...
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Hexagon.
http://wiki.answers.com/Q/What_are_7_sided_shapes_...
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A heptagon? A heptagon?
http://wiki.answers.com/Q/What_a_7_sided_shape_is_...
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Heptagon.
http://wiki.answers.com/Q/What_shape_is_called_wit...
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