A quadrilateral.
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a quadrilateral
In 2 dimensions, a regular 5 sided figure is a pentagon. In 3 dimensions, there is no regular sided 5 sided figure. The tetrahedron is a regular 4 sided figure and a cube is a regular 6 sided figure.
An eight sided figure is called an octagon.
An 11 sided figure is called a hendecagon, an undecagon, or a 11-gon.
A 5-sided figure is called a pentagon.