Going one Better in Geometric Dissections
H. Lindgren
Source abstract
Methods have been described that facilitate the discovery of economical dissections. They are summarized in §§ 1 and 2 that follow. 1. Each of the figures to be dissected is made an element of a strip with parallel sides; 1 and 2 show strips formed from a Latin or tau cross and a pentagon. The first is a P-strip (prototype parallelogram), in which all elements are the same way up. The second is a T-strip (prototype trapezium), in which alternate ones are inverted. Points such as A and B in 1 are called congruent, a term copied from Whittaker and Watson's Modern Analysis, p. 430.
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