is a in which every of a figure is reflected in a . The line in which the points are reflected is called the line of reflection
and acts like a mirror.
More precisely, a reflection across a line
maps every point A
in the into its
such that one of the following statements is satisfied.
- If A is on the line then A and are the same point.
- If A is not on the line then is the of
Like and , reflections are also because they preserve the side lengths and measures. However, reflections change the orientation of the .