In elementary geometry, the property of being perpendicular (perpendicularity) is the relationship between two lines which meet at a right angle (90 degrees). The property extends to other related geometric objects. A line is said to be perpendicular to another line if the two lines intersect at a right angle.
Perpendicular - Wikipedia
https://en.wikipedia.org/wiki/Perpendicular
Perpendicular - Wikipedia
https://en.wikipedia.org/wiki/Perpendicular
In elementary geometry, the property of being perpendicular (perpendicularity) is the relationship between two lines which meet at a right angle (90 degrees). The property extends to other related geometric objects. A line is said to be perpendicular to another line if the two lines intersect at a right angle.
Parallel and Perpendicular Lines | Wyzant Resources
https://www.wyzant.com › Resources › Lessons › Math › Geometry › Lines and Angles
We will use our previous knowledge of slopes and algebraic equations to learn about parallel and perpendicular lines in the coordinate plane. ... Perpendicular Lines. Pairs of lines that intersect each other at right angles are called perpendicular lines. The symbol that represents perpendicularity between two lines is ?. Thus ...Perpendicular lines. (Coordinate Geometry) - Math Open Reference
https://www.mathopenref.com/coordperpendicular.html
When two lines are perpendicular to each other (at right angles or 90°), their slopes have a particular relationship to each other. If the slope of one line is m then the slope of the other line is the negative reciprocal of m, or. negative one over m. So for example in the figure above, the line AB has a slope of 0.5, meaning it 
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