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9.7 Dilations                                            February 01, 2013




                                                         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




                                       Feb 7­9:19 AM

HW pg. 629 #3­21 odds                                                        1
9.7 Dilations                                                       February 01, 2013


    9.7 Dilations
                Reduction: 0 < k < 1                   Enlargement: k > 1




                                       Feb 7­9:50 AM

HW pg. 629 #3­21 odds                                                                   2
9.7 Dilations                            February 01, 2013




                        Feb 7­10:06 AM

HW pg. 629 #3­21 odds                                        3
9.7 Dilations                            February 01, 2013




                        Feb 7­10:09 AM

HW pg. 629 #3­21 odds                                        4
9.7 Dilations                                        February 01, 2013




     Scalar Multiplication: multiplying a matrix by a scalar 
                         (real number)




                              Feb 7­9:53 AM

HW pg. 629 #3­21 odds                                                    5
9.7 Dilations                            February 01, 2013




                        Feb 7­10:11 AM

HW pg. 629 #3­21 odds                                        6
9.7 Dilations                                        February 01, 2013




     Using Matrices: Scale factor multiplied by polygon matrix




                              Feb 7­10:12 AM

HW pg. 629 #3­21 odds                                                    7
9.7 Dilations                            February 01, 2013




                        Feb 7­11:08 AM

HW pg. 629 #3­21 odds                                        8
9.7 Dilations                            February 01, 2013




       HW pg. 629 #3-21 odds




                        Feb 7­10:11 AM

HW pg. 629 #3­21 odds                                        9

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9.7 notes

  • 1. 9.7 Dilations February 01, 2013 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 Feb 7­9:19 AM HW pg. 629 #3­21 odds 1
  • 2. 9.7 Dilations February 01, 2013 9.7 Dilations Reduction: 0 < k < 1 Enlargement: k > 1 Feb 7­9:50 AM HW pg. 629 #3­21 odds 2
  • 3. 9.7 Dilations February 01, 2013 Feb 7­10:06 AM HW pg. 629 #3­21 odds 3
  • 4. 9.7 Dilations February 01, 2013 Feb 7­10:09 AM HW pg. 629 #3­21 odds 4
  • 5. 9.7 Dilations February 01, 2013 Scalar Multiplication: multiplying a matrix by a scalar  (real number) Feb 7­9:53 AM HW pg. 629 #3­21 odds 5
  • 6. 9.7 Dilations February 01, 2013 Feb 7­10:11 AM HW pg. 629 #3­21 odds 6
  • 7. 9.7 Dilations February 01, 2013 Using Matrices: Scale factor multiplied by polygon matrix Feb 7­10:12 AM HW pg. 629 #3­21 odds 7
  • 8. 9.7 Dilations February 01, 2013 Feb 7­11:08 AM HW pg. 629 #3­21 odds 8
  • 9. 9.7 Dilations February 01, 2013 HW pg. 629 #3-21 odds Feb 7­10:11 AM HW pg. 629 #3­21 odds 9