The slopes of two perpendicular lines are negative inverses of each other. In other words, the two slopes when multiplied together equal -1.
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true (APEX)
true (APEX)
Not for the usual definition of the word "opposite." The perpendicular of a line having a slope of 2 has a slope of -0.5.
Parallel lines are never perpendicular. Perpendicular lines are co-planar and cross at right angles.
What is a 'Straight Angle'???? Perpendicular lines meet at 90 degrees ( right- angles).