reflection - deer valley unified school district · object and moving it to a ... translation:...
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1.3 Definitions of Rigid Transformations
I CAN...
Identify rigid motions: reflections, rotations, translations, and compositions
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Rigid Motion: the action of taking an object and moving it to a different location without altering its shape or size.
Corresponding angles and sides stay congruent
NonRigid Motion: Size is changed, but shape is not.
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Reflection: mirror image, a flip over a line of symmetry,
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Reflection: mirror image, a flip over a line of symmetry,
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Sketch the reflection of the figure over the given line
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Translation: slide, glide
A
C
B
D
2
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Translation: slide, glide
A
C
B
D
D' C'
B'A'
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Rotation: twist, turn about a point
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Rotation: twist, turn about a point
Clockwise or Counterclockwise?
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For the following diagram, which description best identifies the rotation of triangle ABC around point Q?
A. 20° clockwise
B. 20° counterclockwise
C. 90° clockwise
D. 90° counterclockwise
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Lines of Symmetry
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Rotational Symmetry
3
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Composition: 2 or moretransformations applied to an object
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What is the composition?