one slope is the negative reciprocal of the other
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draw two intersecting lines that are not perpendicular
Each of the four lines is perpendicular - to two of the other lines.
'two perpendicular number lines are called'Special:Search
Two lines are perpendicular if they meet each other at 90 degrees which is a right angle.
Two lines that are perpendicular to each other intersect at right angles or 90 degrees