# 4-1: Parallel Lines and Planes - PowerPoint PPT Presentation

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4-1: Parallel Lines and Planes. 4-1: Parallel Lines and Planes. Parallel Lines : Two lines that are in the same plane and do not intersect. Above AB || CDAB || CD AB || CDBA || DC. A. B. C. D. 4-1: Parallel Lines and Planes. Parallel planes : Planes that do not intersect

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4-1: Parallel Lines and Planes

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## 4-1: Parallel Lines and Planes

### 4-1: Parallel Lines and Planes

• Parallel Lines: Two lines that are in the same plane and do not intersect.

• Above

• AB || CDAB || CD

• AB || CDBA || DC

A

B

C

D

### 4-1: Parallel Lines and Planes

• Parallel planes: Planes that do not intersect

• Shelves on a bookcase are an example of parallel planes

• Above

• plane PSR || plane JML

• plane PJK || plane SML

• plane JMS || plane KLR

Q

R

P

S

K

L

M

J

### 4-1: Parallel Lines and Planes

• Skew Lines: Lines that do not intersect and ARE NOT in the same plane

• Example

• Lines QP and KL are skew

Q

R

P

S

K

L

M

J

### 4-1: Parallel Lines and Planes

• Name all:

• Planes parallel to plane ABC

• Segments that intersect AB

• Segments parallel to FG

• Segments skew to EF

Plane EFG

BC, AD, AH, AE, and BF

CG, DH, AD, BC, and AH

### 4-1: Parallel Lines and Planes

• Planes parallel to plane ABF

• Segments that intersect DH

• Segments parallel to CD

• Segments skew to AB

Plane DCG

AD, CD, GH, AH, and EH

AB, GH, and EF

DH, CG, FG, and EH

### 4-1: Parallel Lines and Planes

• Assignment

• Worksheet #4-1