Physical Science One of the most amazing formulas in all of ancient mathematics is the formula discovered by the Egyptians to fi nd the volume of the frustum of a square pyramid, as shown in the following fi gure:
The volume of this pyramid is given by (1/3)h • (a2 + ab + b2),
where b is the length of the base, a is the length of the top, and h is the height. (Data from: H. A. Freebury, A History of Mathematics [New York: MacMillan Company, 1968].)
(a) When the Great Pyramid in Egypt was partially completed to a height h of 200 feet, b was 756 feet and a was 314 feet. Calculate its volume at this stage of construction.
(b) Try to visualize the fi gure if a = b. What is the resulting shape? Find its volume.
(c) Let a = b in the Egyptian formula and simplify. Are the results the same?
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