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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A pentagon is a 5 sided polygon
A 5-sided figure is called a "Pentagon".
It is an irregular 5 sided pentagon
A 5 sided pentagon
A pentagon is a FIVE sided plane figure. Those five sides can be all the same length ; hence it is a REGULAR pentagon. or the five sides can be of different lengths ' hence it is just pentagon.