A decagon has 7 more sides than a triangle. A triangle has 3 and a decagon has 10.
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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.
A decagon has 10 sides. Any regular polygon with four or more sides will have pairs of sides that are parallel. A decagon will have 5 pairs of parallel sides.
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a decagon has 10 sides and a pentagon has 5 so if you subtract 5 from ten that is your answer Answer=5