1. 4.8 Transformations
HW pg. 276 #4­22
evens, 26­28
October 28, 2014
Bellwork
Find the value of x.
x = 8 x = 3
3. If the measure of vertex angle of an isosceles triangle is 112°,
what are the measures of the base angles?
34

2. 4.8 Transformations
Translation:
Translation: slides
Reflection:
Reflection:
HW pg. 276 #4­22
evens, 26­28
October 28, 2014
4.8 Congruence Transformations
Transformation: operation that moves or changes a figure
Image: the new figure
moves figure the same distance in same direction
creates a mirror image of original figure
turns a figure around the center of rotation (fixed point)
Rotation:
Rotation:
reflects
rotates

3. 4.8 Transformations
HW pg. 276 #4­22
evens, 26­28
October 28, 2014
Coordinate Notation for Translations
Original Image
(x,y) (x+a, y+b)
Translations

4. 4.8 Transformations
Around the x-axis Around the y-axis
HW pg. 276 #4­22
evens, 26­28
October 28, 2014
Coordinate Notation of Reflections
Reflections
Original Image
(x, y) (x, -y)
Original Image
(x, y) (-x, y)

5. 4.8 Transformations
Clockwise Counterclockwise
HW pg. 276 #4­22
evens, 26­28
October 28, 2014
Coordinate Notation for a RotationRotation
60
Angle of Rotation: rays drawn
from center of rotation to figures
90

6. 4.8 Transformations
HW pg. 276 #4­22
evens, 26­28
October 28, 2014

7. 4.8 Transformations
HW pg. 276 #4­22
evens, 26­28
October 28, 2014
HW pg.276 4-22 evens, 26-28