Proving Parallel Lines & Transversals (Day 3)

Lesson Prep

Lesson Details

• Duration: 50 minutes

• Learning Goal: Continue to build on student understanding of proof and spiral other concepts from the year so far.

Prework

• Make sure you have Chromebooks or some other class set of technology

• Read Nora Oswald's Bucket of Lies to prepare for activity

• Cut out class sets of cards and gather "buckets" for Bucket of Lies activity

Answer Keys

• Link to Answer Keys

Classwork

• Estimation 180 – Day 114 (Andrew Stadel)

• Bucket of Lies

  • Have materials on desks as students walk into room

• Desmos Activity

• Spiraling Practice

Standards

Common Core

• HSG.CO.C.9 – Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment’s endpoints.

TEKS

• G.4(B) – identify and determine the validity of the converse, inverse, and contrapositive of a conditional statement and recognize the connection between a biconditional statement and a true conditional statement with a true converse

• G.4(C) – verify that a conjecture is false using a counterexample

• G.6(A) – verify theorems about angles formed by the intersection of lines and line segments, including vertical angles, and angles formed by parallel lines cut by a transversal and prove equidistance between the endpoints of a segment and points on its perpendicular bisector and apply these relationships to solve problems