Think about reflections in lines that are parallel and then those that intersect.
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Practice makes perfect
Depending on how the lines run relative to each other, a reflection in the two lines will either mimic a rotation or a translation.
Rotation
When two lines intersect at a point P, then a reflection in one line followed by a reflection in the other line, is the same thing as a rotation about the point P.
Translation
When a figure is reflected in two parallel lines, then the two reflections is the same as a translation
