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.
Maryland Content Standard 2.E.2 – Identify and describe symmetry in geometric figures or pictures. (Up to four lines of symmetry)

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?
United States of America
Canada No
Maryland
England 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? 6 8

8. 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
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. The action of turning a figure around a point or a vertex.
Rotation (Turn)
The action of turning a figure around a point or a vertex.

10. Rotation Click the triangle to see rotation
Turning a figure around a point or a vertex
Rotation

11. The action of sliding a figure in any direction.
Translation (Slide)
The action of sliding a figure in any direction.

12. Click the Octagon to see Translation.
The act of sliding a figure in any direction.

13. The result of a figure flipped over a line.
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?