Answer
210
Work Step by Step
We add the area of the bottom equilateral triangle to the lateral area. Recall, the area of an equilateral triangle is $\frac{\sqrt{3}}{4}s^2$. Thus:
$A= \frac{\sqrt{3}}{4}12^2 + 147.32 \approx 210$
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 - Review Exercises - Page 441: 12b
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