Answer
About 8.94 inches
Work Step by Step
l$^2$=4$^2$+8$^2$
l$^2$=80
l$\approx$8.94
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 9 - Section 9.2 - Pyramids, Area, and Volume - Exercises - Page 417: 20
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