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Welcome to Geometry

This course will make math come alive with its many intriguing examples of geometry in the world around you, from baseball to theater lighting to space exploration. Need a little extra help? Want a problem solving challenge? Click on the chapter links below to get lesson help, try an extra challenge, or explore application and career links.

Choose a chapter below.

Chapter 1: Basics of Geometry


Chapter 2: Reasoning and Proof


Chapter 3: Perpendicular and Parallel Lines


Chapter 4: Congruent Triangles


Chapter 5: Properties of Triangles


Chapter 6: Quadrilaterals


Chapter 7: Transformations


Chapter 8: Similarity


Chapter 9: Right Triangles and Trigonometry


Chapter 10: Circles


Chapter 11: Area of Polygons and Circles


Chapter 12: Surface Area and Volume