# Perpendicular Lines

## Lines that intersect at 90 degree or right angles.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Perpendicular Lines

by CK-12 //basic
Use perpendicular line properties and theorems.
MEMORY METER
This indicates how strong in your memory this concept is
0
• Video

## Perpendicular Lines Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on perpendicular lines.
MEMORY METER
This indicates how strong in your memory this concept is
0
• Video

## Perpendicular Lines Examples - Basic

by CK-12 //basic
This video provides the student with a walkthrough of one or more examples from the concept " Perpendicular Lines".
MEMORY METER
This indicates how strong in your memory this concept is
0
• Video

## Parallel and Perpendicular Lines and Planes

by CK-12 //basic
Defines and identifies parallel lines.
MEMORY METER
This indicates how strong in your memory this concept is
2
• Video

## Perpendicular Line Postulate

by CK-12 //basic
What's the perpendicular line postulate and how do you construct a perpendicular line? Watch this video for the answers.
MEMORY METER
This indicates how strong in your memory this concept is
0