Castle Shapes Another great site for identifying and classifying 2D and 3D shapes. A downloadable lesson pack contains worksheets that replicate the on-screen activities, and flash files so that the activities can be used offline as well. There are 5 different activities in all.

3-5

Shapes in Space There are 4 levels of increasing difficulty in this game. Students identify 2D and 3D shapes, discriminate polygons from non-polygons, and attributes such as edges, sides, faces, and vertices. Very colorful with lots of sound effects, and even a arcade game-like bonus round.

6-8

Tetrahedra Investigation This site is visually challenging, but colorful. Here is the description from the website: A short investigation to find the number of ways the net of a tetrahedron can be coloured using four different colours only once. The unit is split into three sections:

How many ways can the net of a tetrahedron be coloured using four different colours only once?

How many ways can the net of a tetrahedron be coloured if rotations arenâ€™t allowed?

How many ways can a 3D tetrahedron be coloured using four different colours only once?

## 3-D Shapes Websites

## K-2

Castle ShapesAnother great site for identifying and classifying 2D and 3D shapes. A downloadable lesson pack contains worksheets that replicate the on-screen activities, and flash files so that the activities can be used offline as well. There are 5 different activities in all.## 3-5

Shapes in SpaceThere are 4 levels of increasing difficulty in this game. Students identify 2D and 3D shapes, discriminate polygons from non-polygons, and attributes such as edges, sides, faces, and vertices. Very colorful with lots of sound effects, and even a arcade game-like bonus round.## 6-8

Tetrahedra InvestigationThis site is visually challenging, but colorful. Here is the description from the website: A short investigation to find the number of ways the net of a tetrahedron can be coloured using four different colours only once. The unit is split into three sections: