This document discusses linear angles formed by parallel lines intersected by a transversal. It begins with an assessment day and learning outcome about using deductive reasoning to justify geometric properties. Students are then introduced to linear angles formed by parallel lines and asked to find measures of angles if one is given. The rest of the document provides tools and definitions for angle relationships formed by parallel lines, such as corresponding angles being congruent. Students practice using these tools and definitions to prove properties about angle measures in different scenarios. The document concludes with instructions to prepare for a quiz by summarizing the mathematics and checking understanding.