**"Polyhedra"**

## Shadows Activity

*By toni On 1 May, 2021 · 2 Comments*

The picture shows some shadows cast by solid (3 dimensional) objects as well as some flat (2 dimensional) shapes.

Describe 3D objects that could have made these shadows. There is more than one answer for each shadow.

Can you draw different shadows that could be made by the same objects?

What sort of shadows […]

## Polyhedra by Paper Folding

*By toni On 2 September, 2020 · Leave a Comment*

A regular polygon has all its angles equal and all edge lengths equal. In a regular polyhedron all the faces are congruent regular polygons and the same number of polygons meet at each vertex.

Each regular polyhedron has its own codename. The tetrahedron is 333, the octahedron is 3333, the icosahedron is […]

## Cube Nets

*By toni On 1 September, 2020 · Leave a Comment*

Some arrangements of six squares form the net of a cube, others do not. Explain why the two shaded arrangements are nets of cubes and the two unshaded arrangements are not.

Draw this net and make your own cube.

How many faces, edges and vertices does a cube have?

[…]

## Tets and Octs Puzzles

*By toni On 1 July, 2020 · Leave a Comment*

First make 6 paper sticks, all the same length, by rolling paper tightly round pieces of string and securing with sticky tape. Then make a rhombus by tying together 5 sticks to make 2 equilateral triangles. Use the rhombus and the one remaining stick to make a shape with […]

## Paper Stick Tetrahedron

*By toni On 29 May, 2020 · Leave a Comment*

Make 6 paper sticks, all the same length, by tightly rolling a piece of paper around a piece of string and securing it with sticky tape. If you have not made paper sticks before see the video: https://youtu.be/iaJ6EitIGKU

## Triangles to Tetrahedra Puzzle

*By toni On 15 May, 2020 · Leave a Comment*

A tetrahedron (plural tetrahedra) is a solid with four triangular faces. How many different tetrahedra can you make using the four different types of triangle shown in the diagram if you have an unlimited number of each type?

Type R are right angled isosceles triangles with sides a, a and b units.

Type […]

## Icosahedron Puzzle

*By toni On 5 May, 2020 · Leave a Comment*

This practical activity involves making a skeletal model of an icosahedron by tying together sticks made from paper rolled tightly around pieces of string. Make 6 rhombuses as shown with 5 sticks for each one.

Tie the rhombuses together to make this pattern noting how the different coloured rhombuses […]

## PRIMARY G5 PYRAMIDS AND PRISMS

*By toni On 5 February, 2018 · Leave a Comment*

In these activities you will investigate the properties of prisms and pyramids. Full instructions are given as to how to roll scrap paper tightly around string to make paper sticks and tie the string together at the vertices to make ‘skeleton’ 3D polyhedra. There are activities for teachers to engage with together […]

## Chain of Polyhedra

*By toni On 12 October, 2017 · Leave a Comment*

A tetrahedron and an octahedron, both have equilateral triangular faces.

Can you arrange these 8 polyhedra in a line so that every two polys next to each other have a face of the same shape. The matching faces do not need to be the same size.

## Painted Cube

*By toni On 5 November, 2016 · 22 Comments*

Imagine a large cube made up from 27 small red cubes each measuring 1 cm by 1 cm by 1 cm. What is its volume?

Imagine dipping the large cube into a pot of yellow paint so the whole outer surface is covered. What is its surface area?

Now imagine breaking the […]

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