Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 10 - Geometry - 10.4 Area and Circumference - Exercise Set 10.4 - Page 647: 19


$72 m^2$

Work Step by Step

The area of a rectangle can be calculated as: $T=a\times b$ The area of this figure can be calculated as: Area of the big rectangle (with sides of $3+9$ and $8+4$) minus the area of the small rectangle (with sides of 8 and 9): $T=(8+4)\times(9+3)-(8\times9)=12^2-72=144-72=72 m^2$
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