class slides

2. Yesterday we discussed reflections.
Did you complete IXL Skills Q.4 & Q.5???

3. A. A horizontal translation 2 units to the right
B. A vertical translation 2 units down
C. A reflection across the x-axis
D. A reflection across the y-axis

4. Transformations
- Translations (slide)
- Reflections (flip)
- Rotations (turn)
- Dilations (zoom)

5. Learn to transform plane figures using
rotations.

6. A rotation turns a figure around a point,
called the center of rotation.

8. Example: Graphing Rotations on a Coordinate Plane
Graph the rotation of triangle ABC 90
counterclockwise about the origin.
Multiply the y-coordinate of each
vertex by –1, and switch the x
and y coordinates.
Rule Image
A(4, 4)A’ (–1  4, 4 ) A’(–4, 4)
B(4, 1)B’ (–1  1, 4) B’(–1, 4)
C(2, 1)C’ (–1  1, 2) C’(–1, 2)
A’ B’
C’

9. Today we learned to transform plane
figures using rotations.
Questions?
What now?
*IXL Q.6
*IXL Q.7