
To state: The postulate that is related to the given procedure.

Answer to Problem 15CE
First: Two lines that are not parallel or overlapping will intersect if they are in the same plane. Second: Two lines that intersect define a plane.
Explanation of Solution
Given information:
A carpenter checks to see if a board is warped by laying a straightedge across the board in several directions.
First: Two lines that are not parallel or overlapping will intersect if they are in the same plane. Second: Two lines that intersect define a plane.
So, if the straightedges are in different directions (meaning not parallel) and they intersect, then the surface they create is a plane, which is straight, and thus the board is not warped.
Chapter 1 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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