Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 8 - Section 8.3 - Regular Polygons and Area - Exercises - Page 378: 20

Answer

205.4 $ft^{2}$

Work Step by Step

Given that the length of the apothem a of a regular octagon is = 7.9ft The side of the octagon s is 6.5 ft We need to find out the area of the octagon The area of the regular polygon whose apothem has length a and whose perimeter p is given by A = $\frac{1}{2}$ ap Given apothem a = 7.9ft perimeter of octagon = ns = 8 * 6.5 = 52 ft A = $\frac{1}{2}$ ap A = $\frac{1}{2}$ * 7.9ft * 52 ft = 205.4 $ft^{2}$
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