Answer
The equation is true because the median of a trapezoid is halfway between the lengths of the parallel sides, or the average of the sides.
Work Step by Step
Observe the figure to come to this conclusion.
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 4.4 - The Trapezoid - Exercises - Page 208: 6
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