Geometry: Common Core (15th Edition)

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

Chapter 5 - Relationships Within Triangles - 5-5 Indirect Proof - Practice and Problem-Solving Exercises - Page 319: 6

Answer

The first step of the indirect proof of this given statement is, "$\triangle PEN$ is not isosceles."

Work Step by Step

An indirect proof starts off by negating what we want to prove. The first step of the indirect proof of this given statement is, "$\triangle PEN$ is not isosceles."
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