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Abacus Mathematics


Harold Jacobs’s Geometry created a revolution in the approach to teaching this subject, one that gave rise to many ideas now seen in the NCTM Standards. Since its publication nearly one million students have used this legendary text. The class uses innovative discussions, cartoons, anecdotes, examples, and exercises that unfailingly capture and hold student interest.


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Lesson 6.1. PARALLEL LINES: Line Symmetry


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