Any pentagon with at least one side that is not the same as another. An irregular pentagon is not a correct answer because it is possible to have an irregular pentagon with equal sides but unequal angles.
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It is an irregular 5 sided pentagon
A pentagon is a 5 sided polygon
A 5-sided figure is called a "Pentagon".
A 5 sided 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.