Answer
It is a square.
Work Step by Step
If a parallelogram has congruent perpendicular diagonals, then it is a square.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 4 - Section 4.3 - The Rectangle, Square, and Rhombus - Exercises - Page 201: 4
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