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Swetz, Frank. The "Piling Up of Squares" in Ancient China. Mathematics Teacher 70 (1977), 72--79.
Chapter IX of the Chiu Chang Suan Shu has a series of interesting problems on the Pythagorean Theorem, many requiring a little resourcefulness to solve, even today. Two methods are used in Chapter IX. This article discusses one of these, the Chi-Chü, or "piling up of squares". This is a dissection method; thus areas are disassembled and reassembled in a different way. The author gives several examples. The last two are among the most interesting. They find the largest square and circle that can be drawn in a right triangle; only the case where the square includes the right angle seems to be considered. The methods are ingenious, and would make appealing classroom demonstrations. The Chi-Chü method is also used in problems that at first seem to have little to do with areas. Problem 14 is an example:Two men starting from the same point begin walking in different directions. Their rates of travel are in the ratio 7:3. The slower walks towards the east. His faster companion walks to the south 10 pu and then turns towards the northeast and proceeds until both men meet. How many pu did each man walk?The author also discusses problem 6, the famous problem of a reed in a square pond:In the center of a square pond whose side measures 10 ch'ih grows a cattail whose top reaches 1 ch'ih above the water level. If we pull the reed toward the bank, its top becomes even with the waters surface. What is the depth of the pond and the length of the plant?As the author observes, this problem is very similar to a much later problem of Bh\=askara, where even the ratios involved are the same:In a certain lake, swarming with red geese, the tip of a bud of a lotus was seen a span (9 inches) above the surface of the water. Forced by the wind, it gradually advanced and was submerged at a distance of two cubits (approximately 40 inches). Compute quickly, mathematician, the depth of the pond.The question of Chinese influence on Indian mathematicians is still unsettled. One can't but wonder how the Chinese became so amazingly successful with the Chi-Chü method. The author mentions the possibility that familiarity with the tangram exercises may have contributed to their skill. Excellent article. Reprinted in Swetz, Frank J., From Five Fingers to Infinity. Closely related topics: The Chiu Chang Suan Shu (Nine Chapters on the Mathematical Art) and Pythagorean Triangles and Triples.