Question

Define polyhedron.

Answer 1

a solid figure with many plane faces, typically more than six.
source: google

Answer 2

A polyhedron is a solid with flat faces. So, to be a polyhedron there should be no curved surfaces.

If you count the number of faces (the flat surfaces), vertices (corner points), and edges of a polyhedron, you can discover an interesting thing:

The number of faces plus the number of vertices minus the number of edges equals 2

This can be written neatly as a little equation:

F + V - E = 2

It is known as Euler's Formula (or the "Polyhedral Formula") and is very useful to make sure you have counted correctly!

But there are cases where it does not work! Read Euler's Formula for more.

Answer 3

A solid figure with many plane faces, usually six or more.