Question 1097523: How do you know if a line is perpindicualar
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! How do you know if a line is perpindicualar [sic]
-----------
A line has to be perpendicular to something, often another line.
---
If they're in the x-y plane, their slopes are negative inverses, eg,
2 and -1/2.
If the angles at the intersection = 90 degs, they're perpendicular.
|
|
|
