Answer
Postulate 1-3
Work Step by Step
This is because it represents that two planes will intersect at one line. This is the definition of the Postulate 1-3 theorem.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 1 - Tools of Geometry - 1-2 Points, Lines, and Planes - Practice and Problem-Solving Exercises - Page 18: 49
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