1. 9.7 Dilations January 30, 2012
Bellwork
How many lines of symmetry does each figure have?
1. A Rhombus that is not a square. 2
2. Equilateral triangle. 3
Does the figure have rotational symmetry? If so,
describe the rotations that map the figure onto itself.
3. Yes; 72° , 144° 4. no
HW pg. 629 #3­21 odds 1

2. 9.7 Dilations January 30, 2012
9.7 Dilations
Reduction: 0 < k < 1 Enlargement: k > 1
HW pg. 629 #3­21 odds 2

3. 9.7 Dilations January 30, 2012
HW pg. 629 #3­21 odds 3

4. 9.7 Dilations January 30, 2012
HW pg. 629 #3­21 odds 4

5. 9.7 Dilations January 30, 2012
Scalar Multiplication: multiplying a matrix by a scalar
(real number)
HW pg. 629 #3­21 odds 5

6. 9.7 Dilations January 30, 2012
HW pg. 629 #3­21 odds 6

7. 9.7 Dilations January 30, 2012
Using Matrices: Scale factor multiplied by polygon matrix
HW pg. 629 #3­21 odds 7

8. 9.7 Dilations January 30, 2012
HW pg. 629 #3­21 odds 8

9. 9.7 Dilations January 30, 2012
HW pg. 629 #3-21 odds
HW pg. 629 #3­21 odds 9