opener new section for notes…...9.3 reflections. essential question learning objective how can...
TRANSCRIPT
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Opener
New section For Notes…...9.3 Reflections
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Essential Question
Learning Objective
How can shapes be moved on a plane?
Given a figure, I will perform a reflection transformation.
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Transformations
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you should know:
what you've learned:
reflections
9.3 Transformations: Reflections
What is perimeter and areahow to calculate perimeter and area of rectangles, squares, and trianglesundefined terms: point, line, planedefined terms: segment, ray, angle, parallel, perpendicularangle pair relationships: complementary, supplementary, linear pair, vertical angles
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infinite
Lines of Symmetry…..What are they? Explain..
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A line that allows a figure to be mapped onto itself.
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Y'
X'
Z'
Flipped?Backwards?Reversed?Mirrored?Reflected?
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A'
B' C'
D'
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A'
B' C'
D'
They are parallel to each other.
They all seem perpendicular to line m. Also, line m seems to cuteach segment in half.
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A
B
C
A’
B’
C’
A'
B'
C'Reflect Across the Y-Axis.
Reflect Across the X-Axis
What do you notice about the X, Y coordinates in each scenario? Any Patterns
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Do the patterns you discovered still hold true?
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5-Minute Check
• Find the coordinates for the following:• A = 5,4 reflect it over Y-axis• A’= -5,4• B= 4,3 Reflect it over Y=2• B’ = 4,1• C= -3,-5 Reflect it over the X-Axis• C’= -3,5
Bonus: Find The Pre-Image given an Image A’=(4,4) that was reflected Across the Y-Axis.A=-4,4
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Essential Question
Learning Objective
How can shapes be moved on a plane?
Given a figure, I will perform a reflection transformation.
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Closure
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HW
HW #5
p.276#17-19, 40p.593 #1-12, 23, 40
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AB
C