SOLUTION: Prove that if both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.

Question 1110545: Prove that if both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.
Answer by ikleyn(52786)   (Show Source): You can put this solution on YOUR website!
.
See the lesson
    - Properties of the sides of a parallelogram, Theorem 2
in this site.

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

The referred lessons are the part of this textbook under the topic "Properties of parallelograms".

Save the link to this online textbook together with its description

Free of charge online textbook in GEOMETRY
https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson

to your archive and use it when it is needed.

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