Nets - This applet folds a 2D net into a 3D object. Click and drag
to manipulate the object/net.
Nets - A net is a two-dimensional figure that can be folded into a
three-dimensional object. Which of the nets below will form a cube?
Solids - Investigate the five Platonic solids (tetrahedron, cube
(hexahedron), octahedron, dodecahedron, and icosahedron). Rotate the shape. Shift-click the edges and the faces to color (and
count them). Can you make V - E + F = 2? (vertices - edges + faces = two)
Solid Duals - Investigate the solids and their duals. The dual of
a solid is formed by taking the midpoint of each face and making these midpoints
the vertices of the new (dual) solid. For the dual, faces become vertices
and vertices correspond to faces.
Explorer - Click "Show Score" to keep track
of your number correct and incorrect. A shape is given and you have to determine
the area and perimeter. Get 4 out of 5 correct and raise your hand for a sticker.
("Adjust the maximum size" three-clicks-to-the-right of the
Explorer - Set the perimeter and then change the shape and see
what areas you can get. All shapes made of unit squares.
Game - Four levels of play (do Levels 1, 2, 3, and 4). Use translation,
rotation, reflection, and dilation.
Platonic Solids - includes nets for the five Platonic solids which you can print out -- on cards stock, cut out, and glue together (you should put tabs on the net when you cut it out so you have something to glue--the tabs end up on the inside of the solid).
How to make a geodesic dome from newspaper - Playground Science: (Boston) (NOTE: The lengths given in the video are incorrect. The lengths should be in a 1.13:1 ratio.) I've made these using lengths of 69 cm and 61 cm. They are cool!