A 5-sided figure is called a pentagon.
Each side is called a face.
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 turned on side is a symbol for infinity. The symbol looks like this ∞.
noting but a 3D figure called a pyramaid
A side of a solid figure is called a face.
It is called a face.
A heptagon
It is called a hexadecagon.
A 5 sided figure is called a: pentagon
A 5-sided figure is called a pentagon.
Is called a dodecagon.
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It is an edge.
It is called the face
The plane.
The polygon (figure) that contains 8 sides is called an "octagon".