pentagon has five equal sides
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A regular pentagon has 5 equal sides.
A regular pentagon has have equal sides. However, in the same way that a square has four equal sides but you can have a four sided figure with equal sides which is not a square, you can have pentagons that are not regular but do have equal sides. Unlike the quadrilateral, which is called a rhombus, there is no special name for a pentagon that has equal sides but not equal angles.
an irregular pentagon has five sides but the sides are not equal
A pentagon if all sides are equal - if they are not it is called a polygon
5 equal sides