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.
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.
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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