Geometry - Grade 4

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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.


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.

rectangular prism

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

triangular prism

prism sort

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.

Nets of a Cube

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.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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