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G1 Lesson 4 Day 1 Reflections.notebook
1
September 16, 2016
Do Now: Complete the translationson Page 26
Module 8.2 Lesson 4 Day 1
Definition of Reflection and Basic Properties
Extra Practice
Page 35 and 36
G1 Lesson 4 Day 1 Reflections.notebook
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September 16, 2016
Notation Translation T(2,-3)
For the following examples, use the following coordinate points to translate figure ABC.
A (-1,6) B (2,4) C (-3,-2)
Example 1: T(2,-3) Example 2: T(1,-4)
pg 26
G1 Lesson 4 Day 1 Reflections.notebook
3
September 16, 2016
Notation Translation T(2,-3)
For the following examples, use the following coordinate points to translate figure ABC.
A (-1,6) B (2,4) C (-3,-2)
Example 1: T(2,3) Example 2: T(1,-4)
pg 26
G1 Lesson 4 Day 1 Reflections.notebook
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September 16, 2016
L
A
P
Q
If line L was a mirror and reflected Points A, Q, and P where would A', Q', and P' now be?
Example 1
G1 Lesson 4 Day 1 Reflections.notebook
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September 16, 2016
Link
G1 Lesson 4 Day 1 Reflections.notebook
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September 16, 2016
So what do you notice about reflections? Talk to me!
G1 Lesson 4 Day 1 Reflections.notebook
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September 16, 2016
Basic Properties of Reflections
• A reflection maps a line to a line, a ray to a ray, a segment to a segment, and an angle to an angle.
• A reflection preserves lengths of segments.
• A reflection preserves degrees of angles.
A
B C
A'
B' C'
G1 Lesson 4 Day 1 Reflections.notebook
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September 16, 2016
Graphing Reflections
A reflection flips a figure over a line of reflection.
The reflected figure or image is congruent to the original figure. All angle measures and side lengths are the same!
Together, an image and its reflection have line symmetry, the line of reflection being the line of symmetry.
S.31
G1 Lesson 4 Day 1 Reflections.notebook
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September 16, 2016
Closing Activity
Explain your procedure for reflecting a shape over a line.