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Module 8.2 Lesson 4 Reflections Day 1.notebook
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Do Now: 1. Take out last nights homework
Module 8.2 Lesson 4 Day 1
Definition of Reflection and Basic Properties
HWpg 35 # 1-5, 8-11
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Homework pg 2728 # 1 & 2
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2.
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What do you notice about this picture?
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DO NOW:
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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
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Link
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We see reflections all around us!
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In photographs....
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In paintings....
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Turn to page
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So what do you notice about reflections? Talk to me!
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LP
PULL
A line of reflection can be any line in the plane. Reflect this Point P and Figure T over this line of reflection.
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Line of reflection
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Turn to page
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SMART Document Camera
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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'
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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.
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SMART Document Camera
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