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In these lessons, we will learn what is a prism. We will learn about rectangular prisms and triangular prisms. We will also learn the nets of prisms.

### Prisms

A prism is a 3-dimensional figure.

All prisms have faces, two of which are referred to as
bases. These two bases are parallel and may take the shape of any polygon.
The name of a prism refers to the shape of the bases, for example, triangular prism, rectangular prism, hexagonal
prisms. In Grade Four,
exploration is focused on rectangular prisms and triangular prisms
only.

A rectangular prism has 6 faces, 12 edges and 8 vertices. Note that all square prisms (or cubes) can be called rectangular prisms because a square is a rectangle.

A triangular prism has 5 faces, 9 edges and 6 vertices.

**What is a prism?**
Prisms are three dimensional figures solids that occupy space. They come in many shapes and sizes and are named by the shape of their base.

**3D-Shapes: Vertices, Edges and Faces**
How to find edges and vertices?

Spheres, triangular pyramids, square based pyramids, and an explanation of edges, vertices and faces.

A vertex is a corner. Plural for vertex is vertices. An edge is a straight line. A face is a surface.

### Nets of Prisms

A net is a 2-dimensional pattern of a 3-dimensional figure that can be folded to form the figure.

The following diagrams show the possible nets for a cube and also nets that cannot form a cube.

**
How to represent 3-dimensional figures with nets by analyzing their faces and bases?**
**Nets of 3D-Shapes**
What is the net of a shape? A few example nets together with their 3D counterparts.

**Make 3D Solid Shapes - Cube**
This video will show how a net is folded to form a cube.

**Make 3D Solid Shapes - Triangular Prism**
This video will show how a net is folded to form a triangular prism.

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