
Concept explainers
To complete the following statement with the word always, sometimes, or never.
Plane X is parallel to plane Y . If plane Z intersects X in line l and Y in line n , then l is ___?___ parallel to n .

Answer to Problem 5ST1
always
Explanation of Solution
Plane X is parallel to plane Y . If plane Z intersects X in line l and Y in line n , then l is always parallel to n .
If two parallel planes are cut by a third plane, then the lines of intersection are parallel.
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