Rs symmetry, rotation, translation, reflection - review
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Transcript of Rs symmetry, rotation, translation, reflection - review
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SymmetryRotation
TranslationReflection
Cecil County Public School. Elkton, MDhttp://tech.ccps.org/downloads/Symmetry,%20Rotation,%20Translation,%20Reflection.ppt
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Symmetry
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What is a line of symmetry?
• A line on which a figure can be folded so that both sides match.
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To be a line of symmetry, the shape must have two halves that match exactly.
When you trace a heart onto a piece of folded paper, and then cut it out, the two half hearts make a whole heart. The two halves are symmetrical.
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Which of these flags have a line of symmetry?
United States of America Canada
Maryland England
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What about these math symbols?Do they have symmetry?
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How many lines of symmetry to these regular polygons have?
Do you see a pattern?
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You can look to see if your name has symmetrical letters in it too!
A B C D E FG H I J K L M N O P Q R S T U V W X Y Z
Infinite number
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Rotation(Turn)
The action of turning a figure around a point or a
vertex.
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Click the
triangle to
see rotationTurning a figure around a point or a vertex
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Translation (Slide)
The action of sliding a figure in any direction.
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The act of sliding a figure in any direction.
Click the Octagon to see
Translation.
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Reflection (flip)
The result of a figure flipped over a line.
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Click on this trapezoid to see reflection.
The result of a figure flipped over a line.
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Which shapes show reflection, translation, or rotation?
2
3
1