1. Chapter 5
Congruent Triangles

2. Section 7 Reflections and Symmetry

3. A ________________________ is a transformation that creates a mirror image. The original figure is reflected in a line that is called the line of reflection.

4. Example 1: Identify Reflections Tell whether the red triangle is the reflection of the blue triangle in line m. (Check the 3 properties) Congruent? Orientation reversed? Is m the perpendicular bisector of corresponding points?

5. Example 2: Identify Reflections Tell whether the red triangle is the reflection of the blue triangle in line m. (Check the 3 properties) Congruent? Orientation reversed? Is m the perpendicular bisector of corresponding points

6. Example 3: Reflections in a Coordinate Plane
Which segment is the reflection of AB in the x- axis? Which point corresponds to A? Which point corresponds to B?
Which segment is the reflection of AB in the y- axis? Which point corresponds to A? Which point corresponds to B?

7. Checkpoint: Identify Reflections Tell whether the red figure is a reflection of the blue figure. If the red figure is a reflection, name the line of reflection.

9. Example 4: Determine Lines of Symmetry Determine the number of lines of symmetry in a square.

10. Example 5: Determine Lines of Symmetry Determine the number of lines of symmetry in each figure.

11. Example 6: Use Lines of Symmetry

13. Checkpoint: Determine Lines of Symmetry Determine the number of lines of symmetry in the figure.

14. EXIT SLIP