1. Transformations –Translation, Reflection, Rotation and Dilations

2. Unit 4 –Transformations
Transformations: It includes a change in a specific directions of a pre-image.
These include translations, reflections, rotations, and dilations.
Pre-image: The position of the shape before the change is made.
Image: The position of the shape after the change is made.
Translation: A transformation that “slides” a shape to another location. No change in size or angle of the shape.

3. 4-1 Translations:
You “slide” a shape up, down, right, left or all the above. Let’s see translation using a vector. Notation:(x, y) ( x + 5, y - 1) 5 units to the right and 1 unit down

4. Transformation (x, y) (x + 5, y + 0) Pre-image A (-2, 4) A’ (3, 4)B B’ C C’ x
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (3, 4)
B’ (2, 2)
C’ (4, 1)

5. Transformation (x, y) (x - 3, y + 0) Pre-image A (-2, 4) A’ (-5, 4)B’ B C C’ x
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (-5, 4)
B’ (-6, 2)
C’ (-4, 1)

6. Transformation (x, y) (x + 0, y - 5) Pre-image Image A (-2, 4)B C x A’
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (-2, -1)
B’ (-3, -3)
C’ (-1, -4) B’ C’

7. Transformation (x, y) (x + 0, y + 4) Pre-image A (-2, 4) A’ (-2, 8)B’ C’ A B C x
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (-2, 8)
B’ (-3, 6)
C’ (-1, 5)

8. Transformation (x, y) (x + 3, y - 4) Pre-image Image A (-2, 4)B C A’ x B’
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (1, 0)
B’ (0, -2)
C’ (2, -3) C’

9. Transformation (x, y) (x + 5, y + 2) Pre-image Image A (-2, 4)B’ C’ B C x
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (3, 6)
B’ (2, 4)
C’ (4, 3)

10. Transformation (x, y) (x - 4, y - 5) Pre-image A (-2, 4) A’ (-6, -1)B C x A’
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (-6, -1)
B’ (-7, -3)
C’ (-5, -4) B’ C’

11. Transformation (x, y) (x - 2, y + 3) Pre-image A (-2, 4) A’ (-4, 7)B’ A C’ B C x
Pre-image
A (-2, 4)
B (-3, 2)
C (-1, 1)
Image
A’ (-4, 7)
B’ (-5, 5)
C’ (-3, 4)

12. CW 4-1: Q# 5,6,9,10,11,12,13,14,17,18

13. Answers