The Reflection in Parallel Lines Theorem says that if two lines are parallel, then a reflection in the first line followed by a reflection in the second line is the same as a translation.
Practice makes perfect
Let's begin by drawing a parallelogram and the two parallel lines.
The Reflection in Parallel Lines Theorem says that if two lines are parallel, then a reflection in the first line followed by a reflection in the second line is the same as a translation. Let's begin by reflecting the parallelogram in line k.
Finally, we will reflect A' in line l
As we can see, the two reflections is the same thing as a translation of A to A''.
