# Perpendicular Lines, Slope, Rays, and Segments | Geometry | Summary and Q&A

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August 25, 2017
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The Organic Chemistry Tutor
Perpendicular Lines, Slope, Rays, and Segments | Geometry

## TL;DR

Perpendicular lines intersect at a 90-degree angle, and their slopes are negative reciprocals of each other.

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### Q: How do you determine if two lines are perpendicular to each other?

Two lines are perpendicular if they intersect at a 90-degree 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 90-degree 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 90-degree 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 90-degree angle between them.