Chapter 1.1

Building Your Geometry Portfolio

“Undefined” TermsPoint – an exact locationLine – never ending straight path Segment – 2 endpoints and all the points betweenRay – never ending path in ONE directionAngle – 2 rays with a common endpointPlane – never ending flat surface

Point

Represented by: a dot

Labeled with: Capital Letter

Written Notation: point A or A

• A• C

• B

Represented by: a line with arrows at each end

Labeled with: 2 Capital Letters or a lower case cursive letter

Written Notation:

Line

l•

•

A

B

Line l AB

Segment

Represented by: 2 dots and a connecting line

Labeled with: 2 Capital Letter

Written Notation: AB

•

•

A

B•

•

C

D

Ray

Represented by: an endpoint and an arrow

Labeled with: 2 Capital Letters

Written Notation: FG ML

F

G

M

L• •

Angle

Represented by: 2 rays

Labeled with: 3 points or the vertex

Written Notation: <F, <HFG, or <GFH

The Vertex is the common endpointThe Sides are the rays

F

G•

• H

PlaneRepresented by: a parallelogram

Labeled with: Capital Cursive Letter or 3 non-colinear points

Written Notation: plane N or

M N LM

Other terms

Intersect – lines, planes, lines & planesCollinearNon-collinearCoplanarNon-coplanarMidpoint