A 'concave decagon' is a ten-sided shape with every other corner pushed in towards the centre. It forms a regular five-pointed star.
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I think regular. * * * * * Only if you ignore all the points where the sides cross one another.
No. An irregular polygon is a polygon whose sides are pretty much out of control. They are usually not equal to any other one side. So, no, a star is actually a REGULAR polygon.
A 6 sided hexagon polygon can be regular or irregular.
A regular six pointed star.
Yes, a regular polygon has all sides of equal length. An irregular polygon is any polygon that is not regular.