# Defining Reflections

- Author:
- kathleenh

- Topic:
- Reflection

## Move points A, B, and C to change the shape of the triangle. Move points P and Q to move the line of reflection. Click the boxes to show segment lengths and AA', BB' and CC'.

## Question 1

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

## Question 2

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

## Question 3

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

## Question 4

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

## Question 5

**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**

## Question 6

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