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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

6. Quadrilaterals

7. Similarity

8. Right Triangle Trigonometry

9. Circles

10. Perimeter and Area

11. Surface Area and Volume

12. Transformations

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