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: 7

Answer

The first step of the indirect proof of this given statement is, "At least one angle is not obtuse."

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, "At least one angle is not obtuse."
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