G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

Order a 12-month Year 7 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 8 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 9 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 10 Interactive Maths software Homework Licence for only $19.95.

Year 7 Interactive Maths - Second Edition


Polyhedra and Prisms

Polyhedra

A polyhedron (or planer body) is a solid or hollow body that is made up entirely of plane faces and is three-dimensional.

For example, a cuboid is a polyhedron as it is entirely made up of planes.  Planes that make up the cuboid are called its faces.  There are six faces of the cuboid.

Cuboid

The plural of polyhedron is polyhedra.  In Greek, poly means many and hedra means base.

A polyhedron is named after its number of faces.  Some polyhedra and their names are shown below.

A tetrahedron has four faces, a heptahedron has 7 faces, an octahedron has eight faces and a enneahedron has nine faces.


A pentahedron has five faces, a hexahedron has six faces and a decahedron has 10 faces.

Other examples of polyhedra are:

A dodecahedron has 12 faces and a icosahedron has 20 faces


Prisms

A prism is a solid with cross-sections that are parallel to its base.

The following solid is a prism.

Triangular prism

A prism is named according to the shape of the its base (i.e. shape of its cross-section).  So, the solid drawn above is an example of triangular prism.

Some other prisms are drawn below:

A rectangular prism, a hexagonal prism and a pentagonal prism.


Key Terms

polyhedron, polyhedra, cuboid, faces, tetrahedron, heptahedron, enneahedron, octahedron, pentahedron, hexahedron, decahedron, dodecahedron, icosahedron, prism, cross-section, triangular prism, rectangular prism, hexagonal prism, pentagonal prism


| Home Page | Order Maths Software | About the Series | Maths Software Tutorials |
| Year 7 Maths Software | Year 8 Maths Software | Year 9 Maths Software | Year 10 Maths Software |
| Homework Software | Tutor Software | Maths Software Platform | Trial Maths Software |
| Feedback | About mathsteacher.com.au | Terms and Conditions | Our Policies | Links | Contact |

Copyright © 2000-2022 mathsteacher.com Pty Ltd.  All rights reserved.
Australian Business Number 53 056 217 611

Copyright instructions for educational institutions

Please read the Terms and Conditions of Use of this Website and our Privacy and Other Policies.
If you experience difficulties when using this Website, tell us through the feedback form or by phoning the contact telephone number.