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CK-12 Geometry

CK-12 Geometry

This is a free, online textbook offered by the CK-12 Foundation.  Although designed for high schools, it could also be used for college freshmen.  Chapters include the following topics: 

1. Basics of Geometry

2. Reasoning and Proof

3. Parallel and Perpendicular Lines

4. Congruent Triangles

5. Relationships Within Triangles...

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