https://docs.google.com/document/d/1ggsTlKDxeptDiQUgBePH03uZfSjDWZfiZrAD7NfXknU/edit?usp=sharing
Unit 01 Lesson 04 (Example 3)
Unit 01 Lesson 05
Unit 01 Lesson 06 (Defined Perpendicular)
