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Mathematics 21 Online
OpenStudy (anonymous):

If two lines are perpendicular to the same line, are they also perpendicular to each other?

OpenStudy (dls):

False, on a planar surface. Two lines which are perpendicular to the same line are parallel to one another, not perpendicular. For example, consider the sides of a rectangle. Adjacent sides are perpendicular to one another, but opposite sides are parallel.

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