{"title":"Alfred S Posamentier","description":"\u003cp\u003eDelve into the captivating world of mathematics with Alfred S. Posamentier. From intriguing puzzles to profound concepts, explore accessible and engaging books that illuminate the beauty and power of numbers.\u003c\/p\u003e","products":[{"product_id":"challenging-problems-in-geometry-book-alfred-s-posamentier-9780486691541","title":"Challenging Problems in Geometry","description":"Stimulating collection of unusual problems dealing with congruence and parallelism, the Pythagorean theorem, circles, area relationships, Ptolemy and the cyclic quadrilateral, collinearity and concurrency, and many other topics. Challenges are arranged in order of difficulty and detailed solutions are included for all. 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This book reveals some of the wonders of mathematics that are often missing from classrooms. Here's your chance to catch up with the math gems you may have missed. Using jargon-free language and many illustrations, the authors--all veteran math educators--explore five areas--arithmetic, algebra, geometry, probability, and the ways in which mathematics can reinforce common sense. Among other things, you'll learn the rule of 72, which enables you to quickly determine how long it will take your bank account to double its value at a specific interest rate. Other handy techniques include an automatic algorithm for multiplying numbers mentally and a clever application that will allow you to convert from miles to kilometers (or the reverse) mentally. A delightful presentation of geometric novelties reveals relationships that could have made your study of geometry more fun and enlightening. 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