Material Detail

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


  • User Rating
  • Comments
  • Learning Exercises
  • Bookmark Collections
  • Course ePortfolios
  • Accessibility Info

More about this material


Log in to participate in the discussions or sign up if you are not already a MERLOT member.