Segments, Rays, and Parallel Lines

Segment : is part of a line that has a beginning point and an endpoint.

Written notation.

A B

AB

A ray is the part of a line that has a beginning point and goes through another point without end, in that direction.

Written notation.

A B D C

AB CD

Opposite rays are two collinear rays with the same beginning point. (line)

Written notation.

B A C

AB , AC

Parallel lines are coplanar lines that do not intersect.

A B

C D

Skew lines do not lie in the same plane, are not parallel, and do not intersect.

A

BS

T

Parallel planes are planes that do not intersect.

P

S

Plane P is parallel to plane S

AB and AD ______ AB and ST are AB and RS are Plane ADR and

BCS Plane RCS and

ABC

Intersect at point A

Skew lines Parallel lines Parallel planes Intersect along

the line DC.

Is CB parallel to GF ? Is plane AED parallel to plane FGH ? Are AB and HG skew lines ?

B

A

E D

C

H

I

JF

G

No

Yes

Yes