A reflection is what occurs when we flip an object or shape across a line. Like a mirror, the object is exactly the same size, just flipped in position. So what was on the left may now appear on the right. Every point on the object or shape has a corresponding point on the image, and they will both have the same distance from the reflection line.
Have a quick play with this interactive. Here you can change the shape that of the object and the position of the mirror line.
Which image below represents the reflection for the following shape about the vertical mirror line?
Which of the following diagrams show a reflection across the given line? Select all the correct options.
Use the invariant properties of figures and objects under transformations (refl ection, rotation, translation, or enlargement)