
Concept explainers
To provide:a counterexample to show given statement is false.

Answer to Problem 9CE
If we look at the wall of the room as a vertical plane, then the lines where wall and the ceiling intercept are horizontal lines, but they lie in the plane.
Explanation of Solution
Given information:
If a line lies in a vertical plane, then the line is vertical.
Calculation:
If we look at the wall of the room as a vertical plane, then the lines where wall and the ceiling intercept are horizontal lines, but they lie in the plane.
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McDougal Littell Jurgensen Geometry: Student Edition Geometry
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