8.18: Transformation Classification
In one room of the museum was a King’s bedroom. The furniture in the room was large and wooden and old with great golden cloths. On the walls was a beautiful red, blue and gold pattern.
Jessica thought that the pattern was the most beautiful one that she had ever heard.
“I love this,” she said to Mrs. Gilman. “I want to draw it, but I’m not sure how.”
“Well, you could break it up into a coordinate grid since the pattern repeats itself and use what we have learned about transformations to draw it in.”
“How could I get started?” Jessica asked.
“Well, start by drawing the coordinate grid, then use these coordinates for one of the diamonds. See if you can figure it out from there.”
In Jessica’s notebook, Mrs. Gilman wrote down the following coordinates.
Jessica began to draw it in. Then she got stuck.
This is where you come in. This Concept will teach you all about drawing transformations. Follow along closely and you can help Jessica draw in the diamonds at the end of the Concept in each quadrant.
Guidance
In the last few Concepts, you learned how to identify and perform different transformations. Remember that a transformation is when we move a figure in some way, even though we don’t change the figure at all. This Concept will teach you how to identify and perform transformations in the coordinate plane.
The coordinate plane is a representation of twodimensional space. It has a horizontal axis, called the
Do you remember the three types of transformations?
The first is a translation or slide. A translation moves a figure up, down, to the right, to the left or diagonal without altering the figure.
The second is a reflection or flip. A reflection makes a mirror image of the figure over a line of symmetry. The line of symmetry can be vertical or horizontal.
The third is a rotation or turn. A rotation moves a figure in a circle either clockwise or counterclockwise.
Now let’s look at performing each type of transformation in the coordinate plane.
As we have said, when we perform translations, we slide a figure left or right, up or down. This means that on the coordinate plane, the coordinates for the vertices of the figure will change. Take a look at the example below.
Now let’s look at performing a translation or slide of this figure.
We can choose the number places that we want to move the triangle and the direction that we wish to move it in. If we slide this triangle 3 places down, all of its vertices will shift 3 places down the
Let’s see why this happens.
We can see the change in all of the
We can translate figures in other ways, too. As you might guess, we move figures right or left on the coordinate grid by their
To graph a translation, we perform the same change for each point. Let’s try graphing a translation.
Slide the following figure 5 places to the right.
In this translation, we will move the figure to the right. That means the
Once we relocate each point 5 places to the right, we can connect them to make the new figure that shows the translation.
We can check to see if we performed the translation correctly by adding 5 to each
These are the points we graphed, so we have performed the translation correctly.
Use coordinate notation to write the coordinates of each translated triangle. The vertices of the original figure have been given to you.
Example A
Triangle
Solution: (0, 5)(1, 7)(4, 4)
Example B
Triangle
Solution: (3,0)(1, 4) (2, 1)
Example C
Triangle
Solution: (0, 2)(4, 6)(5, 1)
Here is the original problem once again. Reread it before working on the drawing.
In one room of the museum was a King’s bedroom. The furniture in the room was large and wooden and old with great golden cloths. On the walls was a beautiful red, blue and gold pattern.
Jessica thought that the pattern was the most beautiful one that she had ever heard.
“I love this,” she said to Mrs. Gilman. “I want to draw it, but I’m not sure how.”
“Well, you could break it up into a coordinate grid since the pattern repeats itself and use what we have learned about transformations to draw it in.”
“How could I get started?” Jessica asked.
“Well, start by drawing the coordinate grid, then use these coordinates for one of the diamonds. See if you can figure it out from there.”
In Jessica’s notebook, Mrs. Gilman wrote down the following coordinates.
Jessica began to draw it in. Then she got stuck.
Now we can draw this diamond in on a coordinate grid. It belongs in Quadrant one. Now we want to draw a diamond into each of the other three quadrants. We can draw this, but we can also use mathematics to figure out the coordinates for each of the other diamonds first.
The diamond in the second quadrant is reflected over the
Next, we can reflect the original diamond in the first quadrant over the
Finally we can reflect this diamond over the
Did you notice any patterns? Take a minute and create this pattern of diamonds in a coordinate grid. Then you will have an even deeper understanding of how a pattern like this one is created.
If you wanted to add in the gold
Vocabulary
Here are the vocabulary words found in this Concept.
 Transformation
 a figure that is moved in the coordinate grid is called a transformation.
 Coordinate Plane

a representation of a twodimensional plane using an
x− axis and ay− axis.

x− axis  the horizontal line in a coordinate plane.

y− axis  the vertical line in a coordinate plane.
Guided Practice
Here is one for you to try on your own.
Slide the following figure 4 places to the left and 2 places up.
Answer
This time we need to perform two movements, both left and up. That means we will change both the
Again, we can check that we performed the translation correctly by changing the
\begin{align*}& \ \ (3, \ 2) \qquad \quad (4, 2) \quad \qquad (1, 4)\\ & 4 +2 \qquad 4 +2 \qquad \ \ 4 +2\\ & (1, \ 4) \qquad \ \ \ (0, \ 0) \qquad \quad \ (3, 2)\end{align*}
These are the points we graphed, so we performed the translation correctly.
Video Review
Here is a video for review.
 This is a James Sousa video which reviews the coordinate plane.
Practice
Directions: Identify the transformations shown below as a translation, reflection, or rotation.
9. True or false. This figure has been translated 5 places to the right.
Directions: Translate each figure to the right 6 places and up 1.
10. Triangle \begin{align*}DEF\end{align*} (1, 2)(1, 6)(2, 1)
11. Triangle \begin{align*}DEF\end{align*} (3, 2)(1, 6)(2, 1)
12. Triangle \begin{align*}DEF\end{align*} (0, 2)(1, 6)(2, 1)
13. Triangle \begin{align*}DEF\end{align*} (4, 2)(1, 6)(2, 1)
14. Triangle \begin{align*}DEF\end{align*} (5, 3)(1, 6)(2, 1)
15. Triangle \begin{align*}DEF\end{align*} (4, 4)(1, 6)(2, 1)
axis
The axis is the horizontal axis in the coordinate plane, commonly representing the value of the input or independent variable.axis
The axis is the vertical number line of the Cartesian plane.Coordinate Plane
The coordinate plane is a grid formed by a horizontal number line and a vertical number line that cross at the (0, 0) point, called the origin. The coordinate plane is also called a Cartesian Plane.Transformation
A transformation moves a figure in some way on the coordinate plane.Image Attributions
Description
Learning Objectives
Here you'll identify and describe transformations in the coordinate plane.