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 8 - Section 8.4 - Circumference and Area of a Circle - Exercises - Page 385: 46



Work Step by Step

When it is raised, the area approximately changes from being two equilateral triangles to being three equilateral triangles. Since all equilateral triangles have the same area, we find: % change = $ \frac{3-2}{2}(100) = 50$%
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