Proving Parallel Lines & Transversals (Day 2)

Lesson Prep

Lesson Details

• Duration: 50 minutes

• Learning Goal: Build conceptual understanding of proving parallel lines & transversal theorems.

Prework

• Watch this video to see how to unpack the upcoming Concept Quiz

Answer Keys

• Link to Answer Keys

Classwork

• Estimation 180 – Day 113 (Andrew Stadel)

• Warm Up

• Unpack upcoming Concept Quiz

• Practice

  • Taken from New Visions

• Conditional Statements & Spiraling

  • Google Slides (embedded above) to use with this handout

1:1 Devices Version

• Pear Deck

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(A) – distinguish between undefined terms, definitions, postulates, conjectures, and theorems

• 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