In these lessons, we will learn what is a prism. We will learn about rectangular prisms and triangular prisms. We aill alos 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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