notes

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Do Now:
Complete the translations
on Page 26
Module 8.2 Lesson 4 Day 1
Definition of Reflection and
Basic Properties
Extra Practice
Page 35 and 36

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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

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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

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Supplemental Practice

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2.
Supplemental Practice

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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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SMART Document Camera

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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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Line of reflection

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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.
S.31

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Turn to page
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Closing Activity
Explain your procedure for reflecting a shape
over a line.

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