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parabola defined by centers of circles touching a line and a point
Construct a Parabola Using Circles
draw an ellipse
Draw an Ellipse
create an ellipse by rolling a disk inside a cake pan
Ellipse with a Cake Pan "Spirograph"
Gluing and Taping
Gluing and Taping
Printing Double-sided Patterns
Printing Double-sided Patterns
Cutting Patterns with a Paper Cutter
Cutting Patterns with a Paper Cutter
octahedron
Octahedron
icosahedron
Icosahedron
tetrahedron
Tetrahedron
Archimedean spiral
Draw an Archimedean spiral