Mentally find the coordinates of the image of under each transformation.
Translate by the directed line segment from to .
Translate by the directed line segment from to .
Reflect across the -axis.
Rotate 180 degrees clockwise using the origin as a center.
2.2
Activity
Inputs and Outputs
For each point , find its image under the transformation .
Next, sketch triangle and its image on the grid. What transformation is ?
For each point in the table, find .
Next, sketch the original figure (the column) and image (the ( column). What transformation is ?
2.3
Activity
What Does It Do?
Here are some transformation rules. Apply each rule to quadrilateral , and graph the resulting image. Then describe the transformation.
Label this transformation :
Label this transformation :
Label this transformation :
Student Lesson Summary
Square has been translated by the directed line segment from to . The result is square .
Two squares on coordinate plane, origin O. Horizontal x axis from negative 2 to 6. Vertical axis from negative 4 to 4. Square A B C D with vertices A at negative 1 comma 1, B at 1 comma 1, C at 1 comma negative 1 and D at negative 1 comma negative 1. Point Q at negative point 5 comma 1. Square A prime B prime C prime D prime with vertices A prime at 4 comma 0, B prime at 6 comma 0, C prime at 6 comma negative 2, D prime at 4 comma negative 2, and Q prime at 4 point 5 comma 0.
Here is a list of coordinates in the original figure and corresponding coordinates in the image. Do you see the rule for taking points in the original figure to points in the image?
original figure
image
This table looks like a table that shows corresponding inputs and outputs of a function. A transformation is a special type of function that takes points in the plane as inputs and gives other points as outputs. In this case, the function’s rule is to add 5 to the -coordinate and subtract 1 from the -coordinate.
We write the rule this way: .
Glossary
None
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