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					  9-1 Introduction to Geometry


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              Warm Up
              California Standards
              Lesson Presentation




Holt CA Course 1
  9-1 Introduction to Geometry


    Warm Up
    What geometry term might you
    associate with each object?
    1. one edge of a cardboard box
       line segment or line
    2. the floor
       plane or rectangle
    3. the tip of a pen
       point


Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry

   Figures are congruent if they have the same shape
   and size. Line segments are congruent if they have
   the same length.
   You can use tick marks to indicate congruent line
   segments. In the illustration below, line segments
   AB and BC are congruent.




Holt CA Course 1
  9-1 Introduction to Geometry

                   Vocabulary
        point
        line
        plane
        ray
        line segment
        congruent



Holt CA Course 1
  9-1 Introduction to Geometry
     Additional Example 1: Identifying Points, Lines,
                       and Planes
    Identify the figures in the diagram.


                            D
                        E
                                F

    A. three points   D, E, and F   Choose any three points.
                                    Choose any two points on
    B. two lines      DE, DF        a line to name the line.
    C. a plane        plane DEF     Choose any three points,
                                    not on the same line to
                                    name a plane.


Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry
                   Check It Out! Example 1
     Identify the figures in the diagram.

                                       G

                               H
                         I         F


    A. four points    H, G, I, and F       Choose any four points.
                                           Choose any two points on
    B. two lines      IH, HF               a line to name the line.
                                           Choose any three points,
    C. a plane        plane IGF
                                           not on the same line to
                                           name a plane.


Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1
  9-1 Introduction to Geometry




Holt CA Course 1

				
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posted:3/18/2013
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