1. Undefined Terms of Geometry
Unit 5 Introduction
Undefined Terms of Geometry
January 5, 2016

2. NOTE TAKING IN YOUR BINDER
Unit 5: Notes
NOTE TAKING IN YOUR BINDER
Notes - Terms of Geometry
To take good notes – make sure
you underline terms, draw
diagrams, identify notations
**use color, it will help**

3. Geometry What is geometry?
Latin in origin
“Geo” means shape
“Metry” means measure
Geometry is the study of the measurement of shapes and relationships in space

4. Undefined Terms of Geometry
Point M
Building
Blocks of
Geometry! P S
Line
Plane
Every topic of geometry is related to points, lines, and planes!

5. Undefined Terms A point represents location. Properties of Points:
No size
No shape
Notation: Capital letter M
Diagram: P A Q L

6. Undefined Terms
A line is a set of infinite points extending in opposite directions.
Properties:
No Thickness or length
Infinite
Notation: Two points: MN
Lower case letter: line l
Diagrams: M N
Line l

7. Undefined Terms
A plane is a set of infinite lines that create a flat surface.
Properties:
No thickness, length, width
Table top
Notation: Capital Letter: plane Z
3 points: plane AIR I R A Z
Diagrams:

8. Relationships In Space

9. Lost In Space… ? The set of ALL points is called space. Properties:
Three dimensional
Consists of points, lines, and planes ?

10. Points, Lines, and Planes in Space
Points in Space:
Points on the same line are called
collinear A B
Points in the same plane are called
coplanar M T H A

11. Intersection of Objects
What does the word intersect mean?
Intersection:
the set of all points that lie in both figures
Symbol: 
Example : Find the Intersection of …

12. Points, Lines, and Planes
Intersection: the set of points that lie in both figures (common points) symbol: 
Two lines intersect at a
point
A plane and a line intersect at a
point
Two planes intersect at a
line

13. Other Spatial Relationships
Endpoint – point on one or both ends of a line label with a letter
Line Segment – a piece of a line with an endpoint on each end -- AB
Ray – starts at an endpoint and continues infinitly in the other direction -- AB
Opposite Rays - Two rays that have a common endpoint and form a line. A B A B A P

14. More Information Congruent – exact same measurement Non- not
Bisect – divide in half
Midpoint – the point in the middle of a line segment

15. Cool Down Fill in the chart to show understanding of the materials
Pick up HW WS after you complete your graphic
organizer/chart