Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-8 Perimeter, Circumference, and Area - Practice and Problem-Solving Exercises - Page 67: 55



Work Step by Step

The pen includes 2 triangles with a base(b) of 1 ft and a height(h) of 3 ft, and one rectangle with a base(b) of 3 ft and a height(h) of 6 ft. Find the area of each, and add them to find the area of the pen. $A_1=\frac{1}{2}bh=\frac{1}{2}(1)(3)=1.5$ $A_2=\frac{1}{2}bh=\frac{1}{2}(1)(3)=1.5$ $A_3=bh=(3(6)=18$ $A=A_1+A_2+A_3=1.5+1.5+18=21$ 21 square feet are needed. Find the cost. $21\ sq\ ft\times\frac{\$1.70}{1\ sq\ ft}=\$35.70$
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