Origami Star

Arthur Lee
Paper folding and cutting for making a star: This is a simulation for analyzing a paper folding and cutting activity (monkiri*) which can make shapes with 5 axes of symmetry. Please see activity 49 in Olson's book for description of this folding. Starting with a 1X2 rectangle (a square folded in half), make a crease as shown. Adjust B' so that angle B'EF is about twice the angle AEB'. Fold F onto B', then fold A as far as possible to the right. If your estimate is good enough, you should see the angles overlap and should be one fifth of a straight angle. Drag the colored vertices to make the fold.
Olson's book, together with other electronic books, is available at http://www.arvindguptatoys.com/ . For other more accurate folding for making regular pentagon, see "Addendum #2" of Jim Loy's page. Check this page for the previewing the star and adjusting the cut: http://ggbtu.be/m787513 * http://en.wikipedia.org/wiki/Kirigami