10 sides and angles
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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].
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A regular decagon has 10 equal sides.
A decagon has 10 sides
There are 10 sides on a decagon
You just call it a decagon. If all the angles and sides are equal then it's a regular decagon. If not, it's an irregular decagon.
Its not a do-decagon its a dodecahedran!!