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 9 - Review Exercises - Page 441: 12b



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: $A= \frac{\sqrt{3}}{4}12^2 + 147.32 \approx 210$
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