Geometry: Common Core (15th Edition)

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

Chapter 4 - Congruent Triangles - 4-1 Congruent Figures - Practice and Problem-Solving Exercises - Page 223: 35



Work Step by Step

If two triangles are congruent, the corresponding angles and sides are congruent as well. Thus, we find: $x+10=2x\\ x=10$ Plugging this back into the original equation: $A=B=2(10)=20$
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