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hexagon, heptagon, octagon, nonagon, decagon, undecagon, dodecagon .... etc
A decagon has 10 sides, and a quadrilateral has 4 sides, therefore a decagon has 6 more sides than a quadrilateral.
A decagon has 10 sides A heptagon has 7 sides Therefore a decagon has 10 - 7 = 3 more sides than a heptagon.
I think it is 4! :} * * * * * You think wrong! A dodecagon has 12 sides, a pentagon has 5. So a dodecagon has 7 more sides.
A decagon has 7 more sides than a triangle. A triangle has 3 and a decagon has 10.