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Question
A line is parallel to xy-plane if all the points on the line have equal
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Solution
A line is parallel to xy-plane if all the points on the line have same distance from xy-plane. Now, distance of a point from xy-plane is z coordinate of the point.
Therefore, a line is parallel to xy-plane if all the points on the line have equal z coordinate.
Therefore, a line is parallel to xy-plane if all the points on the line have equal z coordinate.
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