A shape with 8 equal sides is called a regular octagon.
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A regular 8 sided octagon has eight equal sides.
A regular octagon
An octogon
It is not possible to have five perpendicular sides; four or eight, but not five. A shape with five equal sides is a pentagon.
A shape with eight sides is always an octagon. If all angles and sides are equal, it is called a regular octagon.