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3.1 Intro to Parallel Lines and Planes 2021.notebook October 25, 2021
2.6 and 3.1 Parallel Lines and Planes
Your Name
Mrs. Theo
/ /
Notes
In Algebra 1 (2dimensions), lines could do one of 3 things:
2DTwo Lines 1.) Intersect each other Can
2.) Be Parallel to each other
3.) Be Coinsiding/on top of each other (same line)
x
y
x
y
x
y
3.1 Intro to Parallel Lines and Planes 2021.notebook October 25, 2021
In 3dimensional Geometry, we have other options!
3D Two Lines
Parallel Lines Lines that do not intersect but are in the same plane. Symbol:
Perpendicular segments, rays, and lines intersect to form right angles.
– Symbol:
Skew Lines Lines that do not intersect and are not in the same plane. Only happens in 3D
Parallel Planes Planes (infinite surfaces) that do not intersect.
Infinite Surface
means
Symbols and Notation for Parallel Lines
"Line AB is parallel to line CD"
"Line g is parallel to line h"
A B
C D
g
h
• "Tick marks" used in diagrams
• Notation for parallel lines
3.1 Intro to Parallel Lines and Planes 2021.notebook October 25, 2021
Plane T || Plane Uand
m || n
Example #1
Artist:
Song:
3.1 Intro to Parallel Lines and Planes 2021.notebook October 25, 2021
Example #2
Artist: REM
Song: Man on the Moon