How do you graph points on the coordinate plane?

Start at the origin, the intersection of the x- and y-axes. Use the x-coordinate to move right or left from the origin, and use the y-coordinate to move up or down.

If you know three vertices of a rectangle on the coordinate plane, how could you locate the fourth vertex?

Find the closest two vertices; the x-coordinate of one point and the y-coordinate of the other form the missing point’s coordinate pair.

How do you know when a point has been reflected over the x-axis?

The y-coordinates are opposites.

How do you know when a point has been reflected over the y-axis?

The x-coordinates are opposites.

How are reflections and translations the same?

They both result in an image that is congruent to a pre-image.

How are reflections and translations different?

Reflections make mirror images, while translations slide a shape on the coordinate plane.

What kinds of number patterns or operations are important to look for when you work with transformations?

Opposites, addition, and subtraction

How can you decide if two shapes on the coordinate grid are congruent?

Use transformations to move (or “map”) one shape onto the other.

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Transformations: Reflections & Translations

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What you will learn from this videoWhat you will learn

We'll learn about REFLECTIONS on a coordinate plane.
We will also learn about TRANSLATIONS on a coordinate plane.
And we'll see how this knowledge can help us design a website, create special effects, and even make posters!

Discussion Questions
- Before Video
  How many quadrants are in the coordinate plane?ANSWER
  - Four.
  How do you graph points on the coordinate plane?ANSWER
  - Start at the origin, the intersection of the x- and y-axes. Use the x-coordinate to move right or left from the origin, and use the y-coordinate to move up or down.
  If you know three vertices of a rectangle on the coordinate plane, how could you locate the fourth vertex?ANSWER
  - Find the closest two vertices; the x-coordinate of one point and the y-coordinate of the other form the missing point’s coordinate pair.
  How do you know when a point has been reflected over the x-axis?ANSWER
  - The y-coordinates are opposites.
  How do you know when a point has been reflected over the y-axis?ANSWER
  - The x-coordinates are opposites.
- After Video
  What are two common types of transformations?ANSWER
  - Reflections, translations
  How are reflections and translations the same?ANSWER
  - They both result in an image that is congruent to a pre-image.
  How are reflections and translations different?ANSWER
  - Reflections make mirror images, while translations slide a shape on the coordinate plane.
  What kinds of number patterns or operations are important to look for when you work with transformations?ANSWER
  - Opposites, addition, and subtraction
  How can you decide if two shapes on the coordinate grid are congruent?ANSWER
  - Use transformations to move (or “map”) one shape onto the other.
Vocabulary
- Number line DEFINE
- Origin DEFINE
- Transformation DEFINE
- Reflection DEFINE
- Translation DEFINE
- Prime DEFINE
- Pre-image DEFINE
- Image DEFINE
- x-coordinate DEFINE
- y-coordinate DEFINE
- Congruent DEFINE

Reading Material
Practice Word Problems
Practice Number Problems
Lesson Plan
Teacher Guide
Assessment
Online Quiz Game Quiz PDF Exit Ticket

Transformations: Reflections & Translations

Discussion Questions

Vocabulary

Reading Material

Practice Word Problems

Practice Number Problems

Lesson Plan

Teacher Guide

Assessment