Dec- means 10 like Tri- means 3 tricycle bi means 2 bicycle 2 wheels...
if Dec means 10 then a decagon has 10 sides!
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Any shape with 10 sides is called a decagon. A regular decagon is a shape with 10 even sides, so you are looking for an irregular decagon.
10 sides and angles * * * * * A decagon need not have any equal sides. If it does have equal sides, their number can take any [integer] value in the range [2, 10].
A decagon has 10 sides
There are 10 sides on a decagon
A decagon is a shape that has ten sides. As long as the figure has ten sides to it, then it is a decagon.