This geometry lesson covers dilations. The homework assigned is to complete problems 2-3 on pages 85-86 and to prepare for a quiz on dilations. Examples are worked through demonstrating dilations and identifying scale factors. Students practice identifying similar and non-similar shapes under different scale factors. Key concepts covered are the definition of a dilation, scale factors, and using scale factors to determine if shapes are similar after a dilation.

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Homework:
1.) Pages 85-86 #2-3
2.) Quiz 2 A Day 10/20/16
B Day 10/21/16
Geometry 1 Lesson 9
Properties of Dilations
Day 1
Do Now
Complete Example 8 on Page 77

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G'
H' I'
J'
8.
Sequence of
Transformations:
1.
2.
77

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U'
V'
W'
X'
Sequence of
Transformations:
1.
2.
Supplemental Practice: Page 79

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Supplemental Practice: Page 79

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Supplemental Practice: Page 80

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Supplemental Practice: Page 80

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Similar, same shape
Not similar, different shapes
Similar, same shape
Similar, same shape
81

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Similar, same shape
Similar, same shape
Not similar, different shapes
Not similar, different shapes
82

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means the length of the segment OP.
Scale factor is the ratio of any two corresponding sides
83

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83

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83

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84
Scale factor is 1/2

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84

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85
Scale Factor is 2

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85

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86

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