1. Section 9.1 - Introduction to Geometry: Points, Lines, and Planes
pages

2. · B · C · A Point A point is a location in space. It has no size.
It is noted with a capital letter.
It is written as “Point A”, “Point B”,… .
· A
· C
· B

3. Line
A series of points that extend in opposite directions without end.
A lowercase letter can name a line. A B n
AB, BA, or n

4. Plane A A plane is a flat surface with no thickness.
It contains many lines and extends without end in the direction of all its lines.
Notated: ABCD or M
Examples of planes:
--floor, dry erase board, desktop B A C M D

5. Line segment or segment
A segment is part of a line.
It has two endpoints.
PQ represents the length of PQ.
Noted as PQ or QP Q P

6. Ray R C A ray is part of a line. It has exactly one endpoint.
Name its endpoint first.
Symbolic notation: CR

7. Use the figure to name each of the following:K J
Four points
Four different segments
Five other names for KI
Five different rays

8. Intersecting, Parallel, and Skew Lines
Two lines intersect if they have exactly one point in common.
Two lines that lie in the same plane and do not intersect are parallel.
The symbol “ll” is used to indicate parallel lines.
Segments and rays are parallel if they lie in parallel lines.

9. Skew lines are lines that do not lie in the same plane.
Skew lines are not parallel and do not intersect.
MN intersects NP
MN ll QR
MN and RS are skew M Q N R T V P S

10. You are looking directly down into a wooden crate
You are looking directly down into a wooden crate. Name each of the following
Four segments that intersect PT
Three segments parallel to PT
Four segments skew to PT

11. Homework pages 461 - 463 #s 1-24, 45-48 draw diagrams AND
write problems and answers, EXCEPT for word problems and multiple-choice problems
SHOW ALL WORK!
failure to write problems and/or show work will result in either receiving partial or no credit