Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 5 - Section 5.4 - The Pythagorean Theorem - Exercises - Page 253: 21


length=12 cm

Work Step by Step

In a rectangle diagonal make two congruent right triangles. So by Pythagoras theorem $Diagonal^{2}= width^{2}+length^{2}$ $20^{2}=16^{2}+length^{2}$ $400=256+length^{2}$ $144=length^{2}$ length=12 cm
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