Given that is a quadrilateral, where , and the figure is the image of the figure by reflection in the straight line , find .
Step 1: Determine .
and are consecutive interior angles formed
by a straight line intersecting two parallel lines. Thus, the
angles are supplementary (with a sum of ). Therefore,
we can find by subtracting from
Step 2: Determine .
A reflection transforms a figure into a congruent figure with
equal angle measures. Therefore,