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Two lines are parallel if the angle between them is zero degrees (or 180 degrees). Equivalently,
we can say that two lines are parallel if they have the same slope and they are perpendicular if
their slopes are the negative reciprocal of each other. In this video we do a number of exercises
involving parallel and perpendicular lines.
Prof. Serna. Math, Statistics & Physics Tutor. Miami.
10300 SW 72nd Street, Suite 460-5, Miami, FL 33173.