CHAPTER 1-1 (IDENTIFYING POINTS, LINES, & PLANES)

What is the difference between a point, a line, and a plane?

Think of a football field. The players are the points, yard lines, and the field is the plane.

CHAPTER 1-1 (IDENTIFYING POINTS, LINES, & PLANES)

Point: No dimension. Represented by a dot.

Line: One dimension. Never ends, keeps going in both directions. ( ) Use 2 points to name a line.

Plane: 2 dimensions. Represented by a parallelogram, but does not end. Named by 3 points.

CHAPTER 1-1 (IDENTIFYING POINTS, LINES, & PLANES)

Example:

Collinear Points Coplanar Points

Identify the lines, points, and plane in the figure given.

V

T

S

Q

R

n

m

P

CHAPTER 1-1 (IDENTIFYING POINTS, LINES, & PLANES)

Segments & Rays Line Segment: Has 2 endpoints. Written as AB

Ray: Has one endpoint, then continues to go the other direction. Written CD

A B

C D

CHAPTER 1-1 (IDENTIFYING POINTS, LINES, & PLANES)

Examples Give another name for GH

Name all rays with endpoint J

Are HJ and JH the same ray?

HJ and HG?

E

G

FH

J

CHAPTER 1-1 (IDENTIFYING POINTS, LINES, & PLANES)

Intersection Where geometric figures have one or more points in common.

CHAPTER 1-1 (IDENTIFYING POINTS, LINES, & PLANES)

Examples Name the intersection of MX and line a

Name the intersection of plane C and plane D