No... A decagon has 10 sides... A Dodecagon has 12...
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A Decagon has 10 sides....
A decagon has 10 sides, and a quadrilateral has 4 sides, therefore a decagon has 6 more sides than a quadrilateral.
Decagon.
12cm a decagon is 10 sides 120/10=12
A decagon has 10 sides A heptagon has 7 sides Therefore a decagon has 10 - 7 = 3 more sides than a heptagon.