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Perpendicular lines are two lines that intersect at a right angle (90 degrees). In the Cartesian plane, their slopes are negative reciprocals of each other.
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Slope: The measure of the steepness or incline of a line, often denoted as $m$ in equations.
Right Angle: An angle that measures exactly 90 degrees.
Negative Reciprocal: The inverse value with an opposite sign; for example, the negative reciprocal of $a$ is $-\frac{1}{a}$.