Answer
The proven statement of a formal proof can not be cited as a reason in a proof.
Work Step by Step
This should actually be the last STATEMENT of a proof, NOT reason.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Section 1.7 - The Formal Proof of a Theorem - Exercises - Page 53: 10b
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