High School Geometry Powerpoint Lessons
created by Justin O'Brien

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Lesson 1
Undefined Terms
Lesson 2
Rays and Angles
Lesson 3
Polygons, Triangles
Lesson 4
First Postulates
Lesson 5
Substitution and Partition Postulates
Lesson 6
Addition and Subtraction Postulates
Lesson 7
Multiplication and Division Postulates
Lesson 8
Proofs with Postulates and Definitions
Lesson 9
Angle Theorems (part 1)
Lesson 10
Angle Theorems (part 2)
Lesson 11
Congruent Polygons, SAS Postulate
Lesson 12
ASA Postulate
Lesson 13
SSS Postulate
Lesson 14
Special Line Segments in Triangles
Lesson 15
Corresponding Segments and Angles
Lesson 16
Isosceles and Equilateral Triangles
Lesson 17
Proofs with Congruent Triangles
Lesson 18
Proofs with Overlapping Triangles
Lesson 19
Proving Lines Perpindicular
Lesson 20
Proving Lines Parallel
Lesson 21
Properties of Parallel Lines
Lesson 22
Sum of Angle Measure in a Triangle
Lesson 23
AAS Theorem