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# Reflections 1

Lesson 4 of 18

## Objective: SWBAT understand reflection across the x-axis and y-axis.

#### Warm Up

*10 min*

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.

For a video narrative about how I structure each lesson, and how the warm-up fits in, click here.

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#### Play of the Day

*40 min*

For today's Play of the Day, I go in-depth with two examples that have multiple questions. If you download the file, you can see my comments on how I progress through the questioning.

The basic premise is that I use the geomirrors for Example 1, but then switch to no mirrors for Example 2. How do you get there? By choosing a point that is equidistant from the line of reflection. It's a pretty cool lesson... and pushes kids to do some spatial reasoning that is not particularly easy for all of them.

In terms of using the geo-mirrors, the kids get pretty good at using them pretty quickly. They need to move their eyes on either side of the mirrors to see where the reflection should be, and if they reflected properly. I highly recommend their use, particularly over the course of a few days, and especially as the reflections become more difficult (over the line y=x).

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#### Huddle

*10 min*

Because we are still in the early stages, I like to review the Silver problem from 8 - 4 WU103 Reflections 1 in the huddle. It allows students to review translations while also applying reflections. I go through the reflections in two ways... with geomirrors and without (equidistant from the line of reflection). This provides a powerful and simple end to the lesson.

#### Resources

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#### Homework

*15 min*

Homework is to be completed at home and should take students approximately 15 minutes.

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- UNIT 1: FLUENCIES AND THE LANGUAGE OF ALGEBRA
- UNIT 2: SOLVING LINEAR EQUATIONS
- UNIT 3: INTRODUCTION TO FUNCTIONS
- UNIT 4: INTERPRETING AND COMPARING LINEAR FUNCTIONS
- UNIT 5: SYSTEMS OF LINEAR EQUATIONS
- UNIT 6: EXPONENTS AND SCIENTIFIC NOTATION
- UNIT 7: PARALLEL LINES, TRANSVERSALS, AND TRIANGLES
- UNIT 8: CONGRUENCE AND SIMILARITY THROUGH TRANSFORMATIONS
- UNIT 9: PATTERNS OF ASSOCIATION IN BIVARIATE DATA
- UNIT 10: SLOPE REVISITED
- UNIT 11: VOLUME OF CYLINDERS, CONES, AND SPHERES
- UNIT 12: POLYNOMIALS AND FACTORING
- UNIT 13: QUADRATIC FUNCTIONS

- LESSON 1: Introduction to congruence and similarity through transformations
- LESSON 2: Translations 1
- LESSON 3: Translations 2
- LESSON 4: Reflections 1
- LESSON 5: Reflections 2
- LESSON 6: Reflections 3
- LESSON 7: Rotations 1
- LESSON 8: Rotations 2
- LESSON 9: Mixed Review - Transformations
- LESSON 10: Congruence and Similarity Through Transformations Test 1
- LESSON 11: Dilations 1
- LESSON 12: Dilations 2
- LESSON 13: Similarity 1
- LESSON 14: Similarity 2
- LESSON 15: Series of Transformations that Lead to Congruence
- LESSON 16: Series of Transformations that Lead to Similarity
- LESSON 17: Mixed Review - Transformations
- LESSON 18: Congruence and Similarity Through Transformations Unit Test