The transformation maps rectangle QRST to Q'R'S'T' is reflection.
An image will reflect through a line, known as the line of reflection. A figure is said to be a reflection of the other figure, then every point in a figure is at equidistant from each corresponding point in another figure.
As, 2 rectangles have identical side lengths and angle measures.
Also, second rectangle is a reflection of the first
and we know that the reflection of any shape done in a manner that it is equally reflected having identical side lengths and angle measures.
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