Answer
240
Work Step by Step
We find the height of each triangle:
$ h = \sqrt{13^2 - 5^2 }=\sqrt{144}=12$
Thus, we find the lateral area:
$A = (1/2)(12)(4)(10)=240$
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 9 - Section 9.2 - Pyramids, Area, and Volume - Exercises - Page 422: 22a
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