If two lines are coplanar, then they are (always, sometimes, never) perpendicular
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If two lines are coplanar, then they are (always, sometimes, never) perpendicular

[From: ] [author: ] [Date: 11-10-07] [Hit: ]
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Sometimes. Parallel lines, intersecting lines, and perpendicular lines are all coplanar, so coplanar lines are only sometimes perpendicular.
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