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2006-4-15
Paper Folding
Making shapes with reflectional symmetry

Volume of Pyramid (Cabri 3D figures)
Compare 2 triangular pyramids with same base and height
tripyramid.cg3
Dissect a triangular prism into 3 pyramids of equal volume
triprism3.cg3
Net of an octahedron (Cabri 3D figures)
Net of a regular octahedron
The same net but folded into another octahedron