Prove interior angles of a triangle using transversals
Lesson 5 of 9
Objective: SWBAT prove that the interior angles of a triangle sum to 180 degrees, using transversals.
Each day, students complete a warm-up that usually consists of spiraling the previous day's material, in addition to older material. Warm-up problems also sometimes extend lessons that students have encountered before to more unfamiliar contexts. Today's warmup can be found in 7 - 5 WU95.
For a video narrative about how I structure each lesson, and how the warm-up fits in, click here.
Play of the Day
I push kids to come up to the board to prove that the interior angles of a triangle is 180 degrees, using transversals. I have include two student proofs on video below and a third can be seen see students actually doing this on video. The Student Work file contains several examples of the students' written proofs.
Student Proof #1
Student Proof #2
Homework 7 - 5 HW95 is to be completed at home and should take students approximately 15 minutes.