Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - Common Core Cumulative Standards Review - Selected Response - Page 136: 12


$20\ cm^2$

Work Step by Step

If the height is $h$, the base is $3h-7$. Write an equation to find the height. $b=3h-7$ $5=3h-7\longrightarrow$ substitute the given base size $12=3h\longrightarrow$ addition property of equality $4=h\longrightarrow$ division property of equality $A=bh=5\times4=20$
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