4-1: Parallel Lines and Planes

4-1: Parallel Lines and PlanesPARALLEL LINES: Two lines that are in the

same plane and do not intersect.

AboveAB || CD AB || CDAB || CD BA || DC

A

B

D

C

4-1: Parallel Lines and PlanesPARALLEL PLANES: Planes that do not

intersectShelves on a bookcase are an example of

parallel planes

Aboveplane PSR || plane JMLplane PJK || plane SMLplane JMS || plane KLR

P

Q R

S

J

KL

M

4-1: Parallel Lines and PlanesSKEW LINES: Lines that do not intersect

and ARE NOT in the same plane

ExampleLines QP and KL are skew

P

Q R

S

J

KL

M

4-1: Parallel Lines and PlanesName 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

EH, AD, and BC

CG, DH, AD, BC, and AH

4-1: Parallel Lines and PlanesYOUR TURN. Name all:

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 PlanesAssignment

Worksheet #4-1