## A Real Example of a Reflection

It is easier to understand reflection with an example. The diagram below shows a reflection of a shape. The shape before the reflection (called the**object**) is in light blue. The shape after the reflection (called the

**image**) is in dark blue:In this example, the shape has reflected in a line of reflection (shown as a red dashed line) on the y-axis.

## Properties of a Reflection

- Each point in the image is the same perpendicular distance from the line of reflection as the corresponding point in the object.Point
**A'**is the reflection of point**A**. They are both 3 squares away from the line of reflection. Point**B'**is the reflection of point**B**. They are both 1 square away from the line of reflection. - The image is the same size as the object.
- If you were to fold the diagram along the line of reflection, the image would fit exactly over the object.

## Reflected Shapes Are Congruent Shapes

If a shape can be transformed to another using only reflection, then the two shapes are**congruent**. Congruent shapes have the same size, line lengths, angles and areas. They are the same shape and size, just in a different position.

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