Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 8 - Section 8.1 - Area and Initial Postulates - Exercises - Page 350: 28


(a) $220~ft^2$ (b) $1408

Work Step by Step

(a) We can find the area of the upper section: $A_1 = (12~ft)(10~ft) = 120~ft^2$ We can find the area of the lower section: $A_2 = (10~ft)(10~ft) = 100~ft^2$ The total area is $220~ft^2$ (b) We can find the cost: $cost = (\$6.40/ft^2)(220~ft^2) = \$1408$
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