1. What are congruent figures?

Congruent figures have the same shape and size.

2. Which points do not change under a reflection?

Points on the mirror line are invariant (do not change) under a reflection.

3. What is the connection between the mirror line and the line joining a point and its image?

They intersect (cross) at right angles.

4. What is an image?

An image is the result of carrying out a transformation such as a reflection on an object.