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
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Parallel & perpendicular lines | Basic geometry (video) | Khan Academy
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Perpendicular lines are lines that intersect at a 90-degree angle. ... So line ST is perpendicular to line CD ...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.
Perpendicular and Parallel - Math is Fun
www.mathsisfun.com/perpendicular-parallel.html
Perpendicular and Parallel. Perpendicular. It just means at right angles (90°) to. The red line is perpendicular to the blue line in each of these examples: Perpendicular Examples. (The little box drawn in the corner, means "at right angles", so we didn't really need to also show that it was 90°, but we just wanted to!)
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