Defining Reflections

Select the boxes for AA', BB' and CC'. What do you about the slope of these lines and the line of reflection, PQ?

Select the box for Lengths. What do you notice? What is the relationship between the line of reflection and AA', BB' and CC'?

Move point P to point A. How does this affect A'?

What is true about the line of reflection and line segments AA', BB' and CC'?

Write a precise definition for a rotation, using the following words or objects:

• Line of reflection PQ
• Point A, not on the line PQ
• Point B, on the line PQ
• Line segment AA'
• Perpendicular bisector

Which of the following are properties of the reflected triangle A'B'C'?