# Four-Piece Dissection of Juel's Pyramid to a Prism

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This Demonstration shows a four-piece dissection of Juel's pyramid to a prism using the dissection of a Hill tetrahedron of the first type. The three-piece dissection of any Hill tetrahedron of the first type was found independently by Schobi (1985) and Hanegraaf.

Contributed by: Izidor Hafner (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

Juel's pyramid has the base of a cube and apex the center of the cube. A dissection of the pyramid to a parallelepiped is described in [2]. The construction consists of cutting the pyramid into three layers.

There is a hinged dissection of the Hill tetrahedron to a triangular prism, using a construction found independently by P. Schobi and A. Hanegraaf [1]. This is a three-piece dissection. Together these yield a four-piece dissection of Juel's pyramid to the prism.

[1] G. N. Frederickson, *Dissections: Plane & Fancy*, New York: Cambridge University Press, 2002 p. 235.
[2] H. Meschkowski, *Grundlagen der Euklidischen Geometrie* (Croatian edition), Zagreb: Skolska Knjiga, 1978 pp. 211–214.

## Permanent Citation

"Four-Piece Dissection of Juel's Pyramid to a Prism"

http://demonstrations.wolfram.com/FourPieceDissectionOfJuelsPyramidToAPrism/

Wolfram Demonstrations Project

Published: March 7 2011