A five sided figure is a geometric figure called a pentagon. You are aware of others, like squares, triangles, rectangles, I'm sure. Then, there are the "gon" ones, like pentagon, hexagon, and octagon.

The United States defense authority is contained in a building called the Pentagon, because it is a five-sided compound.

A five-sided figure in euclidean geometry is called a pentagon. Like the Pentagon in the US. That got blown up and then rebuilt with half its retaining wall.

...Polygon or a pentagon. A pentagon with 5 equal sides is a reqular pentagon, if it has a longer side/ larger smaller angles it is a irregular pentagon.

...A five sided shape is called a pentagon

they can be drawn many different ways as long as the shape contains 5 sides

also having 5 corners