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A regular pentagon has five sides of equal lengths.
A plane shape with five sides of equal length, and five equal angles: each of 108 degrees.
It is not possible to have five perpendicular sides; four or eight, but not five. A shape with five equal sides is a pentagon.
Pentagons don't have to have equal sides. The definition of a pentagon is simply a polygon with 5 sides and 5 interior angles. This means that as long as some shape has 5 sides and 5 interior angles (not necessarily all equal), then it is a pentagon.
An irregular pentagon.