Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 6 - Polygons and Quadrilaterals - 6-2 Properties of Parallelograms - Lesson Check - Page 363: 7


Although both types of polygons have four sides and four angles, and a parallelogram is technically a quadrilateral, there is one important difference: A parallelogram must have two sets of parallel sides whereas in a quadrilateral, the sides do not have to be parallel at all.

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