A regular decagon has 10 equal sides.
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It still has ten sides, same as a normal decagon. "Irregular" simply means that all the sides and angles of the decagon are not congruent.
A decagon has 10 sides
There are 10 sides on a decagon
Its not a do-decagon its a dodecahedran!!
Decagon is 10 sides. Octagon is 8 sides.