 # Constructions with Paper Folding

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You can fold the unit square piece of paper, yellow on one side, light blue on the other, by dragging its lower-left corner. Use the 2D sliders to place the points , , … on the paper. There are three special cases:

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• Messner's method for doubling a cube using origami

• Abe's angle trisection

• Constructing a point on a parabola given by a horizontal directrix and focus . Suppose the point is on the directrix; find a crease that maps into . Then the intersection of the crease with the vertical line through is on the parabola.

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Contributed by: Izidor Hafner  (April 2019)
Using code by: Borut Levart
Open content licensed under CC BY-NC-SA

## Snapshots   ## Details

Huzita's axioms [1, pp. 285-286]:

A1. Given two points, one can fold a crease line through them.

A2. Given two points, one can fold a crease along their perpendicular bisector, folding one point on top of the other.

A3. Given two lines, one can fold their bisector crease, folding one line on top of the other.

A4. Given two points and a line, one can fold a crease through one point perpendicular to the line, folding the line onto itself.

A5. Given two points and a line, one can fold a crease through one point that maps the other point onto the line.

A6. Given two points and two lines, one can fold a crease that simultaneously maps one point to one line and the other point to the other line.

Hatori suggested a seventh axiom [1, p. 288]:

A7. Given one point and two lines, one can fold a crease perpendicular to one line so that the point maps to the other line.

Messner's method is mentioned in [1, p. 289]. Doubling a cube using origami was first proved in 1936 by Margherita Piazzola Beloch [1, p. 289; 2, pp. 323–226].

Abe's angle trisection is explained in [1, p. 287].

For a construction of an equilateral triangle, see [3, p. 9].

References

 E. D. Demaine and J. O'Rourke, Geometric Folding Algorithms: Linkages, Origami, Polyhedra, New York: Cambridge University Press, 2007.

 M. Friedman, A History of Folding in Mathematics: Mathematizing the Margins, New York: Springer Berlin Heidelberg, 2018.

 T. S. Row, W. W. Beman and D. E. Smith, Geometic Exercises in Paper Folding, New York: Dover Publications, 1966.

## Permanent Citation

Izidor Hafner

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