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

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August 25, 2017
by
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.

## Key Insights

• 🔺 Perpendicular lines intersect at right angles, forming a 90-degree angle.
• 🫥 The slope of a perpendicular line is the negative reciprocal of the given line's slope.
• 🙌 Segments and rays can also be perpendicular, with a 90-degree angle between them.
• 🔺 The total measure of an angle in a perpendicular scenario is the sum of the two smaller angles formed.
• 🔺 Algebraic equations can be used to find the measure of angles in perpendicular scenarios.
• 🆘 Factoring and solving equations can help find the value of variables and angle measures.
• 👋 Checking the answer by confirming that the angles add up to 90 degrees is a good practice.

## Transcript

in this video we're going to talk about perpendicular lines rays and segments and we're going to work on some problems as well so let's call this line l and let's say that line l is perpendicular to line m whenever two perpendicular lines intersect each other they intersect at right angles so that is they intersect at an angle of 90 degrees now let... Read More

### 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.