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Problem Solving Using Auxiliary Lines, Paperback by Chen, Yongcheng, ISBN 1975681754, ISBN-13 9781975681753, Like New Used, Free shipping in the US Math Competition Books Series (9th book)This book introduces some commonly used skills to draw auxiliary lines in plane geometry problem solving. Th can be used by students preparing for math competitions such as Mathcounts, AMC 10/12/AIME.
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