SOLUTION: A quadrilateral is called a "parallelogram" if both pairs of opposite sides are parallel. Show that if WXYZ is a parallelogram, then angle W = angle Y and angle X = angle Z.

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Question 1052146: A quadrilateral is called a "parallelogram" if both pairs of opposite sides are parallel. Show that if WXYZ is a parallelogram, then angle W = angle Y and angle X = angle Z.
Answer by ikleyn(52858) About Me  (Show Source):
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A quadrilateral is called a "parallelogram" if both pairs of opposite sides are parallel.
Show that if WXYZ is a parallelogram, then angle W = angle Y and angle X = angle Z.
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In a parallelogram, the opposite angles are congruent.

This theorem was proved in the lesson
    - Opposite angles of a parallelogram
in this site.

Also,  you have this free of charge online textbook on Geometry
    GEOMETRY - YOUR ONLINE TEXTBOOK
in this site.

The referred lesson is the part of this online textbook under the topic "Properties of parallelograms".