Question 1052146
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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

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Parallelograms/Opposite-angles-of-a-parallelogram-are-congruent.lesson>Opposite angles of a parallelogram</A>

in this site.


Also, &nbsp;you have this free of charge online textbook on Geometry

&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson>GEOMETRY - YOUR ONLINE TEXTBOOK</A> 

in this site.


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