1. Platonic Solids
Paul, Chris, Becky, Charlie & Lisa

2. Starter
•Use Geomags and Polydrons to create 3D shapes
(5 minutes)
•Discuss the properties of shapes created (5 mins)
•Ask if there are any special cases...
•Choose two to discuss.
•Identify a Platonic Solid

3. Introduce Platonic Solids
• Discuss the concept of Platonic Solids
• Open question: How many do you think there are?
• How many can you make? (10 minutes)
• Put checklist up on the board
• Same number of regular faces meeting at each vertex
• Each face is the same regular shape
• Each vertex has the same number of faces

4. There are only 5
• Lets look at the five in more detail:
• Look at table of each type, number of faces, number of
vertices
• cube square 6 sides 8 vertices
• dodecahedron, pentagon, 12 sides, 20 vertices
• icosahedron, triangles, 20 sides, 12 vertices
• octahedron, triangles, 8 sides, 6 vertices
• tetrahedron, triangle, 4 sides, 4 vertices

5. Plenary
•Where have you seen these platonic solids in the
world?
•Bring up photos...

6. Extension
•Duals sheet - sketch the duals
•Can you make shapes with more than one type of
regular face (Archimedian Solids)
•Patterns in a table

7. Extension
•Duals sheet - sketch the duals
•Can you make shapes with more than one type of
regular face (Archimedian Solids)
•Patterns in a table