Method and apparatus for constructing pyramid

DETAILED DESCRIPTION I claim: 1.
A method for forming a pyramid having four triangular faces of equal area, comprising the steps of (a) forming fold lines on a circular piece of material having a circular front surface and a circular back surface, said fold lines being formed on at least one of said surfaces and including (i) six chord lines defining a first and a second equilateral triangle, the apexes of each of said triangles lying along the circumference of said circular face and each side of said first triangle being parallel to one side of said second triangle, (ii) three diameter lines each traversing and passing through the center point of said surface and through a pair of the points at which said chord lines forming said triangles intersect, and (iii) a fourth diameter line traversing and passing through said center point of said surface and intersecting a pair of said apexes of said triangles at the circumference of said surface, said fold lines defining a plurality of secondary equilateral triangles on said surface smaller than said first and second equilateral triangles, including a group of six secondary equilateral triangles of equal size forming a hexagon in the center of said surface, one apex of each of said six triangles lying at the center point of said surface, and a mirror image pair of said six triangles being bisected by said fourth diameter line, the remaining four of said six triangles being free of fold lines traversing the area thereof, (b) sequentially folding said piece of material along said fold lines to form a pyramid, the four faces of said pyramid each corresponding to one of said four secondary triangles free of fold lines traversing the area thereof.




Description:
This invention relates to apparatus and methods for constructing pyramids.
More particularly, the invention relates to a circular piece of material which can be sequentially folded along chord lines formed thereon to construct a pyramid.
In a further and more specific respect the invention concerns a method for manually constructing a pyramid having four equal sized faces from a plain piece of circular material having no chord lines formed on the surface thereof, the pyramid being constructed from the circular piece of material without the use of a straight-edge, rule, compass or any other auxiliary drawing, measuring, cutting or inscribing tool and without having to utilize adhesive or mechanical fasteners to secure sections of material to one another