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1-2: Points, Lines, and
Planes
Basic Geometry Terms
Undefined Terms
 Definition of words
 Consist of other words
 How do you define the first word?
 Philosophy Class?
 Every end has a start
 Every effect has a cause
 Geometry undefined terms
 Point, line, and plane
 Used to build the definitions of other figures
Undefined Terms
 Point – indicates a location and has no size
 Line – represented by a straight path that
extends in two opposite directions without end
and has no thickness. A line contains infinitely
many points.
 Plane – represented by a flat surface that
extends without end and has no thickness. A
plane contains infinitely many lines.
Undefined Terms
 Collinear Points – points that lie on the same line
 Coplanar – when points and/or lines lie on the same plane
Defined Terms
 Segment – part of a line that consists of two endpoints and all points between
them.
 Ray – part of a line that consists of one endpoint and all the points of the line
on one side of the endpoint
 Opposite rays – two rays that share the same endpoint and form a line
Example
 Use the diagram to answer each question.
- Name two coplanar lines.
- Name three non-collinear points.
- Name the plane two different ways.
- Name a pair of opposite rays.
W
X
Z
Y
V
Take Home Message
 Undefined terms are used as building blocks of Geometry (and Math)
 Geometry will have a lot of vocabulary words
 The concepts will give us algebraic equations
 Geometry will enhance our artistic abilities
1.2 Continued
 Postulate – accepted statement of fact
 Like undefined terms, used as building blocks of the logical system in geometry
 Also known as axioms
 Postulate 1.1- through any two points, there is exactly one line
 Postulate 1.2- if two distinct lines intersect, then they intersect in exactly
one point.
1.2 Continued
 Postulate 1.3- if two distinct planes intersect, then they intersect in exactly
one line
1.2 Continued
 Postulate 1.4 – through any three noncollinear points, there is exactly one
plane
 Where does Plane ABCD intersect
Plane ACEG?
 What plane contains the points
C, D, and B?
 What plane contains the points
E, F, and C?
Example
A
C
B
E
G
F
H
D
Take Home Message
 Postulates are assumed to be true
 No formal proof
 Relationship between dimensions
 A point is the intersection of two lines
 A line is the intersection of two planes
 A plane is the intersection of 3D figures

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1-2 PowerPoint.pptx

  • 1. 1-2: Points, Lines, and Planes Basic Geometry Terms
  • 2. Undefined Terms  Definition of words  Consist of other words  How do you define the first word?  Philosophy Class?  Every end has a start  Every effect has a cause  Geometry undefined terms  Point, line, and plane  Used to build the definitions of other figures
  • 3. Undefined Terms  Point – indicates a location and has no size  Line – represented by a straight path that extends in two opposite directions without end and has no thickness. A line contains infinitely many points.  Plane – represented by a flat surface that extends without end and has no thickness. A plane contains infinitely many lines.
  • 4. Undefined Terms  Collinear Points – points that lie on the same line  Coplanar – when points and/or lines lie on the same plane
  • 5. Defined Terms  Segment – part of a line that consists of two endpoints and all points between them.  Ray – part of a line that consists of one endpoint and all the points of the line on one side of the endpoint  Opposite rays – two rays that share the same endpoint and form a line
  • 6. Example  Use the diagram to answer each question. - Name two coplanar lines. - Name three non-collinear points. - Name the plane two different ways. - Name a pair of opposite rays. W X Z Y V
  • 7. Take Home Message  Undefined terms are used as building blocks of Geometry (and Math)  Geometry will have a lot of vocabulary words  The concepts will give us algebraic equations  Geometry will enhance our artistic abilities
  • 8. 1.2 Continued  Postulate – accepted statement of fact  Like undefined terms, used as building blocks of the logical system in geometry  Also known as axioms  Postulate 1.1- through any two points, there is exactly one line  Postulate 1.2- if two distinct lines intersect, then they intersect in exactly one point.
  • 9. 1.2 Continued  Postulate 1.3- if two distinct planes intersect, then they intersect in exactly one line
  • 10. 1.2 Continued  Postulate 1.4 – through any three noncollinear points, there is exactly one plane
  • 11.  Where does Plane ABCD intersect Plane ACEG?  What plane contains the points C, D, and B?  What plane contains the points E, F, and C? Example A C B E G F H D
  • 12. Take Home Message  Postulates are assumed to be true  No formal proof  Relationship between dimensions  A point is the intersection of two lines  A line is the intersection of two planes  A plane is the intersection of 3D figures