Lines that intersect to form right angles at their point of intersection have slopes that are negative reciprocals.
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They are angles formed when two straight lines intersect: they are on opposite sides of the point of intersection.
Two lines that intersect at a right angle are called perpendicular.
Perpendicular lines intersect each other at right angles which is 90 degrees.
If they do intersect, it will be at their point of intersection.
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