### Activity 2: Prisms, Pyramids & Anti-Prisms

We have names for different families of objects. Below is a guide explaining Prisms, Pyramids and Anti-Prisms. Using this guide, and your GeoGenius construction kit pieces, make as many prisms, pyramids and anti-prisms as you can.

### Anti-Prisms

ANTI-PRISM is the name given to an object with identical parallel polygonal bases joined by an alternating band of triangles. The GeoGenius construction kit can be used to make anti-prisms.
The name of an anti-prism is determined by the name of the shape of the bases.

*The four anti-prisms above are called (clockwise from top left):*

1. triangular based anti-prism

2. square based anti-prism

3. hexagonal based anti-prism

4. pentagonal based anti-prism
### Prisms

PRISM is the name given to an object with identical parallel polygon bases and other faces made of parallelograms.
If the sides of the prism are made using a rectangle the prism is called a rectangular prism – the GeoGenius construction kit can be used to make rectangular prisms.

The name of a prism is determined by the name of the shape of the bases.

*The four rectangular prisms above are called (clockwise from top left):*

1. triangular based prism

2. square based prism

3. hexagonal based prism

4. pentagonal based prism
### Pyramids

PYRAMID is the name given to an object with a polygonal base whose other faces are all triangles which meet at a point called the apex.
If the apex of the pyramid is above the centre of the base, the pyramid is called a right pyramid – the GeoGenius construction kit can be used to make right pyramids.

*L:* Right Pyramid. *R:* Oblique Pyramid
The name of a pyramid is determined by the name of the shape of the base.

*The four right pyramids above are called (clockwise from top left):*

1. triangular based pyramid

2. square based pyramid

3. hexagonal based pyramid

4. pentagonal based pyramid