Splash Screen Then/Now You wrote algebraic and two-column proofs. (Lesson 2–6) Write proofs involving segment addition. Write proofs involving segment congruence. Concept…

Splash Screen Then/Now You used properties of special parallelograms. (Lesson 6–5) Apply properties of trapezoids. Apply properties of kites. Vocabulary trapezoid bases…

Splash Screen Then/Now You used angle and line segment relationships to prove theorems. (Lesson 2–8) Identify relationships between two lines or two planes. Name angle…

Splash Screen Then/Now You found slopes of lines and used them to identify parallel and perpendicular lines. (Lesson 3–3) Recognize angle pairs that occur with parallel…

Splash Screen Then/Now You classified polygons with four sides as quadrilaterals. (Lesson 1–6) Recognize and apply properties of the sides and angles of parallelograms.…