Liu Hui on the volume of a pyramid - 5.
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A yangma has breadth 5 chi , length 7 chi and height 8 chi . Liu Hui's comment on this problem is translated in Section 6 below. Since this translation is somewhat difficult to follow, I give here a summary in modern terms. If a yangma has dimensions a , b , and h as shown in Figure 2, then it can be fitted together with a bienao to form a qiandu as shown in Figure 3. Then we have the following situation.