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Symmetry

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Symmetry Rotation Translation Reflection Symmetry What is a line of symmetry? A line on which a figure can be folded so that both sides match. What about these math ... – PowerPoint PPT presentation

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Title: Symmetry


1
  • Symmetry
  • Rotation
  • Translation
  • Reflection

2
Symmetry
3
What is a line of symmetry?
  • A line on which a figure can be folded so that
    both sides match.

4
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.
5
Which of these flags have a line of symmetry?
No
No
6
What about these math symbols?
Do they have symmetry?

-
Yes
Yes
x
Yes
Yes
7
How many lines of symmetry to these regular
polygons have?
5
4
3
Do you see a pattern?
8
6
8
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
9
Rotation(Turn)
  • The action of turning a figure around a point or
    a vertex.

10
Click the triangle to see rotation
Turning a figure around a point or a vertex
Rotation
11
Translation (Slide)
  • The action of sliding a figure in any direction.

12
Click the Octagon to see Translation.
Translation
The act of sliding a figure in any direction.
13
Reflection (flip)
  • The result of a figure flipped over a line.

14
Reflection
Click on this trapezoid to see reflection.
The result of a figure flipped over a line.
15
Which shapes show reflection, translation, or
rotation?
Reflection
Rotation
Translation
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