**ABOUT:**

A solid figure can be defined by the number and combination of certain parts. These parts are:

- Faces
- Edges
- Vertices

These three parts are relevant to any solid that has flat surfaces, places where flat surfaces intersect and places where planes intersect.

A **face** is any flat surface. The flat surface that makes the front of this cube is called a face. Many solid figures have more than one face.

An **edge** is the line segment where two faces meet. You can see by looking at this cube that the faces intersect in a line. Many solid figures have more than one edge.

A vertex is a point where several planes meet in a point. The arrow here is pointing to a vertex of this cube. Many solids have more than one vertex, or many vertices.

**DEMONSTRATION:**

How many edges, faces and vertices are there in this figure?

First, count the edges, which will be line segments.

There are 8 line segments, so there are 8 edges.

Next, count the faces, which will be flat surfaces or flat planes.

There are 5 flat planes, so there are 5 faces.

Then, count the vertices, which are points or corners where several edges or faces meet.

There 5 points, so there are 5 vertices.

The answer is, there are five vertices, five faces and eight edges.