LESSON
12-1
Properties of Translations
Reading Strategies: Build Vocabulary
A transformation is an operation that describes a change in the position,
size, or shape of a figure. A translation is one kind of transformation.
A translation
shows a slide
of a figure.
Two sides of a
figure meet at
a vertex.
5. Describe the translation.

In Exercises 1-5, use the translation shown.
1. What is the image of the translation?
2. What is the preimage of the translation?
B
3. How many vertices does the preimage have?
4
4. Is the image congruent to the preimage?
Explain
В'
The original figure that is
translated is the preimage.
The figure that results after a
translation is the image.
The points of an image are
identified using prime notation
C'is read as "C prime."
B
A
--B
20
B