Introduction -- Pretest -- Lesson 1. The basic building blocks of geometry -- Lesson 2. Types of angles -- Lesson 3. Working with lines -- Lesson 4. Measuring angles -- Lesson 5. Pairs of angles -- Lesson 6. Types of triangles -- Lesson 7. Congruent triangles -- Lesson 8. Triangles and the Pythagorean Theorem -- Lesson 9. Properties of polygons -- Lesson 10. Quadrilaterals -- Lesson 11. Ratio, proportion, and similarity -- Lesson 12. Perimeter of polygons -- Lesson 13. Area of polygons -- Lesson 14. Surface area of prisms -- Lesson 15. Volume of prisms and pyramids -- Lesson 16. Working with circles and circular figures -- Lesson 17. Coordinate geometry -- Lesson 18. The slope of a line -- Lesson 19. The equation of a line -- Lesson 20. Trigonometry basics -- Posttest -- Answer key -- Glossary -- Appendix A. Postulates and theorem -- Appendix B. Additional resources.