Perpendicular Lines, Slope, Rays, and Segments  Geometry  Summary and Q&A
TL;DR
Perpendicular lines intersect at a 90degree angle, and their slopes are negative reciprocals of each other.
Questions & Answers
Q: How do you determine if two lines are perpendicular to each other?
Two lines are perpendicular if they intersect at a 90degree angle, forming right angles.
Q: What is the relationship between the slopes of perpendicular lines?
The slopes of perpendicular lines are negative reciprocals of each other. To find the slope of a perpendicular line, flip the fraction and change the sign.
Q: Can segments and rays be perpendicular?
Yes, segments and rays can be perpendicular if they intersect at a 90degree angle.
Q: How do you find the measure of an angle in a perpendicular scenario?
In a perpendicular scenario, you can find the measure of an angle by adding the measures of the two smaller angles formed.
Summary & Key Takeaways

Perpendicular lines intersect at right angles, with a 90degree angle between them.

The slope of a perpendicular line is the negative reciprocal of the slope of the given line.

Segments and rays can also be perpendicular, with a 90degree angle between them.