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## 8th grade (Eureka Math/EngageNY)

### Unit 2: Lesson 1

Topic A: Definitions and properties of the basic rigid motions- Introduction to geometric transformations
- Identifying transformations
- Identify transformations
- Translations intro
- Translating points
- Translate points
- Translating shapes
- Translating shapes
- Translate shapes
- Determining translations
- Determine translations
- Rotations intro
- Rotating points
- Rotate points (basic)
- Determining rotations
- Determine rotations (basic)
- Reflecting points
- Reflect points
- Reflecting shapes
- Reflecting shapes
- Reflect shapes
- Determining reflections
- Determine reflections
- Translations review
- Rotations review
- Reflections review

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# Translations intro

CCSS.Math: , ,

Learn what translations are and how to perform them in our interactive widget.

To see what a

**translation**is, please grab the point and move it around.Nice! You

*translated*the point. In geometry, a translation moves a thing up and down or left and right.Here, try translating this segment by dragging it from the middle, not the endpoints:

Notice how the segment's direction and length stayed the same as you moved it. Translations only move things from one place to another; they don't change their size, arrangement, or direction.

Now that we've got a basic understanding of what translations are, let's learn how to use them on the coordinate plane.

## Translations on the coordinate plane

Coordinates allow us to be very precise about the translations we perform.

Without coordinates, we could say something like, "We get start color #ca337c, B, prime, end color #ca337c by translating start color #11accd, B, end color #11accd down and to the right."

But that's not very precise. If we use a coordinate grid, we can say something more exact: "We get start color #ca337c, B, prime, end color #ca337c by translating start color #11accd, B, end color #11accd by 5 units to the right and 4 units down."

More compactly, we can describe this as

**a translation by open angle, 5, comma, minus, 4, close angle.**The negative sign in front of the 4 tells us the vertical shift is downwards instead of upwards. Similarly, a translation to the left is indicated by the first value being negative.

### Pre-images and images

For any transformation, we have the

**pre-image**figure, which is the figure we are performing the transformation upon, and the**image**figure, which is the result of the transformation. For example, in our translation, the pre-image point was start color #11accd, B, end color #11accd and the image point was start color #ca337c, B, prime, end color #ca337c.Note that we indicated the image by start color #ca337c, B, prime, end color #ca337c, pronounced B prime. It is common, when working with transformations, to use the same letter for the image and the pre-image, simply adding the "prime" suffix to the image.

## Let's try some practice problems

### Problem 1

### Problem 2

### Challenge problem

## Want to join the conversation?

- What can I do to relate to this in my life(97 votes)
- Moving. Anything.

If you walk to your door, you're technically translating yourself from where you are to the door, whilst it's in 3D you can still think of walking maybe North 1 meter and West 3 meters, or you could be walking to the store, you go from your house to the store a certain distance one way, then more distance another way which will end up with you in the position of the store. Anytime something moves from one point to another, that's a translation(60 votes)

- Everybody who is here is an omega chad.(40 votes)
- im confused when it doesnt tell you to expand the circle(28 votes)
- its bc the website probably glitched out or they just forgot to make the circle the size it was supposed to be(12 votes)

- For challenge question 2, how come it isn't the first answer?(11 votes)
- Because if you moved it (1,4), it would end C" would end up 2 spaces to the right, as a movement of (1,4) from point C means the same thing as moving point C 1 space to the right, and four spaces up. The correct answer, answer c, moves point C (-1,4)- 1 space to the left (-1), and 4 spaces up (4). Hope this helps.(15 votes)

- What are the types of translations? Other than left and right and up and down.(2 votes)
- Hi Aidan,

Translations can make an object move only left, only right, only up, only down or a combination of them, such as left & up, left & down.

I hope this helps.

Aiena.(11 votes)

- How is this going to help me get a job(6 votes)
- Why is translation, rotation, and reflection needed in real life.(5 votes)
- Why would it be -1,4 if it is going down?(4 votes)
- It's not going down point C is the starting point and it is moving to create point C'(2 votes)

- How i don't understand this(4 votes)
- this is boring(4 votes)