1. Symmetry

2. Warm-Up Reflect ΔABC across the y-axis. A(2, 3) B(0, -1) and C(-2, 3)
What can we say about our pre-image and our image?

3. Vocabulary
Line Symmetry – when a figure that is reflected across a line or lines maps onto itself.
Rotational Symmetry – when a figure that is rotated a certain degree less than 360 around its center maps onto itself.

4. Lines of Symmetry
How many lines of symmetry does the polygon have? 3

5. Rotational Symmetry
How many lines of symmetry does the shape have? 2

6. Lines of Symmetry
How many lines of symmetry does the shape have? 5

7. 360÷3 = 120 Rotational Symmetry
What is the degree of rotational symmetry?
360÷3 = 120

8. 360÷2 = 180 Rotational Symmetry
How many lines of symmetry does the shape have?
360÷2 = 180

9. 360÷5 = 72 Rotational Symmetry
How many lines of symmetry does the shape have?
360÷5 = 72