Elementary Geometry for College Students (5th Edition)

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

Chapter 10 - Section 10.1 - The Rectangular Coordinate System - Exercises: 34

Answer

A$\triangle$=25

Work Step by Step

1. Use formula for the area of a triangle to solve (A=$\frac{1}{2}$bh) to find the area of all 3 triangles. 2. Use A=lw to find the area of the rectangle 3. subtract the area of all 3 triangles from the area of the rectangle. (combine whole numbers to make mixed fractions, combine mixed fractions to get whole numbers in work below) a. 8$\times$7-$\frac{1}{2}$$\times$5$\times$1-$\frac{1}{2}$$\times$7$\times$7-$\frac{1}{2}$$\times$ 1$\times$8 b. 56- $\frac{5}{2}$ -$\frac{49}{2}$- $\frac{8}{2}$ c. 56-31=25
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