00833cam a2200217 4500 503759130 TxAuBib 20100127120000.0 081013s2009||||||||||||||||||||||||eng|u 9780756651640 0756651646 TxAuBib Ball, Johnny. Why pi / Johnny Ball. New York, N.Y. : DK Pub., 2009. 93 p. : col. ill.,maps. Focusing on how people from ancient Egyptians to modern scientists have used numbers to measure things through the ages, "Why Pi?" makes math interesting and is filled with games, puzzles, brainteasers, and fun facts. 20100127. Measurement. Mathematics Juvenile literature.