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 (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 9 - Section 9.2 - Pyramids, Area, and Volume - Exercises - Page 407: 20
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