# A 3Dlink between maths D & T Science and Kids

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Published on September 30, 2008

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A 3D link between maths, D&T,science and kids. : A 3D link between maths, D&T,science and kids. Adrian Oldknow a_oldknow@compuserve.com 8 December 2004 The regular polyhedra : The regular polyhedra The regular polyhedra are sometimes known as the Platonic solids. There are only five of them. The faces of the tetrahedron, octahedron and icosahedron are equilateral triangles. The faces of the cube are ???? The faces of the dodecahedron are ???? Here are the triangular three. : Here are the triangular three. A cube and a dodecahedron : A cube and a dodecahedron Accounting : Accounting For each of the regular polyhedra can you count the number of faces (F), edges (E) and vertices (V)? Tetrahedron: F = V = E = Cube: F = V = E = Octahedron: F = V = E = Dodecahedron: F = V = E = Icosahedron: F = V = E = Leonhard Euler : Leonhard Euler Dates: 1707-1783 Swiss – from Basel F + V = E + 2 True for all polyhedra Try a square based pyramid F = V = E = Semi-regular polyhedra : Semi-regular polyhedra There are 14 semi-regular polyhedra They are also known as the Archimedean solids. Their faces are a mixture of regular polyhedra. The same number of each type of face meet at every vertex. The truncated icosahedron has two hexagons and a pentagon at each vertex. The truncated icosahedron : The truncated icosahedron Accounting again : Accounting again How many hexagons H How many pentagons P How many edges E How many vertices V Does (H+P) + V = E + 2 Is Euler satisfied? Buckminster Fuller : Buckminster Fuller Who was Buckminster Fuller? What is a Bucky Ball? What does “geodesic” mean? Where can you see Bucky Balls? A Bucky Ball – familiar? : A Bucky Ball – familiar? Black and blue should be what? : Black and blue should be what? Carbon 60 : Carbon 60 Who is Harry Kroto? What is Buckminster Fullerine? What shapes do Carbon molecules have? Diamond? Graphite? What shape is C-60? Where do kids come across this shape? So solid shapes are one link! : So solid shapes are one link! Polyhedra in maths Molecular and crystal structures in science Shapes used in the built environment, shapes used to package objects,..in D&T Shapes met in the world outside school

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