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