Perpendicular!!!
Geometry
Level
1
Given m1 and m2 be the respective slopes of two perpendicular lines. Then m1m2 is equal to
The answer is -1.
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1 solution
If m 1 is the slope of a line, then a perpendicular line will have slope m 2 = − 1 / m 1 . So m 1 m 2 = − 1