Special angle pairs
Lesson 1 of 9
Objective: SWBAT identify special angle pairs and determine angle measurements.
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.
In today's warm-up, because it is the first lesson of a new unit, I review the Homework instead to maximize time in introducing a new concept. The HW on a unit assessment day is generally spiraled review of previous topics, so it is a nice review of older material that improves retention over the course of the year.
Play of the Day
For the huddle for this lesson, I really like to go over Silver Problem 5 in detail. The primary lesson I want them to learn is the elegant logical structure that underlies the whole endeavor of geometry. I push students to not only identify the correct answers, but the logic behind each measurement. I also make clear that there is more than one way to prove the measure of each angle... another beautiful element in math.
In this particular problem, I really stress the vocabulary to identify each angle. Getting kids fluent in the vocabulary of, especially, congruent and supplementary, is absolutely critical as this unit develops. I keep pushing kids until they use the correct vocabulary, and then sometimes I even do an activity where I have kids close their eyes and I say something related to the definition, and they call out the vocabulary words.
Me: Angles that sum to 180 degrees.
Me: Angles that are opposite of each other and congruent.
HW89 Special angle pairs is to be completed at home and should take students approximately 15 minutes.