Any polygon is regular if its sides are all the same length, or irregular if they're not.
If all 10 sides of your decagon are the same length, then you have a regular decagon.
If they're not, then you have an irregular one.
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A regular decagon has 10 equal sides.
A decagon is a shape that has ten sides. As long as the figure has ten sides to it, then it is a decagon.
A decagon.
A decagon is a ten sided figure (usually a regular ten sided figure with all interior angles equal and all sides equal in length) A polygon is a closed planar figure bounded on all sides by straight lines. A polygon can have any number (greater than two) of sides.
None. A decagon is a 2-dimensional geometric figure and there are no events in it!