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1.2 Segments and Congruence                                                                  August 15, 2011




                                          Bellwork
    1. Give definition of coplanar points.  points that are on the same plane
    2. What is another way to write line segment AB?             BA or AB

    3. Sketch a plane and two intersecting lines that lie in the plane.
                                                                     # 4 & 5
                                                                                        Y

                                                                            W       V
                                                                                             X
    4. What is another name for ZY?    YZ          Z

    5. A student says the VW and VZ are opposite rays because they
    have the same endpoint. Describe the error.
             Point V must lie between points W and Z, which means the 3 points must be collinear.




HW pg. 12 #6­11, 13­17, 24­27                                                                                  1
1.2 Segments and Congruence                                            August 15, 2011




          1.2 Segments and Congruence
                   Postulate: A rule that is accepted w/o proof
                   Theorem: A rule that can be proved

          Ruler Postulate: Points on a line can be matched with
                           real numbers (AKA coordinate)
                                                Names of Points
                                           A                      B
                                           x1                   x2
                                            Coordinates of Points

                                Distance = absolute value of the difference
                                                    AB
                                           A                      B
                                           x1                     x2

                                                AB = x2 - x1




HW pg. 12 #6­11, 13­17, 24­27                                                            2
1.2 Segments and Congruence     August 15, 2011




HW pg. 12 #6­11, 13­17, 24­27                     3
1.2 Segments and Congruence                                    August 15, 2011




        Segment Addition Postulate: If B is between A & C,
                                     then AB + BC = AC.
            *between: the point in the middle of 2 collinear points on
                       the same line       A
                                                       B
                                                           C



                                     AC



                            A             B        C


                                AB            BC




HW pg. 12 #6­11, 13­17, 24­27                                                    4
1.2 Segments and Congruence     August 15, 2011




HW pg. 12 #6­11, 13­17, 24­27                     5
1.2 Segments and Congruence     August 15, 2011




HW pg. 12 #6­11, 13­17, 24­27                     6
1.2 Segments and Congruence     August 15, 2011




HW pg. 12 #6­11, 13­17, 24­27                     7
1.2 Segments and Congruence                                          August 15, 2011




       Find Length of GH                                      36


                                                     F         G     H

                                                         21
         FH = FG + GH (Segment Addition Postulate)
         36 = 21 + GH
         36-21 = GH
         15 = GH



       Congruent Segements: line segments w/ same length
                                            Equal        Congruent
             A              B

             C              D             AB = CD              AB ≅ CD 




HW pg. 12 #6­11, 13­17, 24­27                                                          8
1.2 Segments and Congruence     August 15, 2011




HW pg. 12 #6­11, 13­17, 24­27                     9
1.2 Segments and Congruence     August 15, 2011




HW pg. 12 #6­11, 13­17, 24­27                     10
1.2 Segments and Congruence                August 15, 2011




                                HW: p 12
                                 # 6-11
                                  13-17
                                 24-27




HW pg. 12 #6­11, 13­17, 24­27                                11

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1.2 notes

  • 1. 1.2 Segments and Congruence August 15, 2011 Bellwork 1. Give definition of coplanar points. points that are on the same plane 2. What is another way to write line segment AB? BA or AB 3. Sketch a plane and two intersecting lines that lie in the plane. # 4 & 5 Y W V X 4. What is another name for ZY? YZ Z 5. A student says the VW and VZ are opposite rays because they have the same endpoint. Describe the error. Point V must lie between points W and Z, which means the 3 points must be collinear. HW pg. 12 #6­11, 13­17, 24­27 1
  • 2. 1.2 Segments and Congruence August 15, 2011 1.2 Segments and Congruence Postulate: A rule that is accepted w/o proof Theorem: A rule that can be proved Ruler Postulate: Points on a line can be matched with real numbers (AKA coordinate) Names of Points A B x1 x2 Coordinates of Points Distance = absolute value of the difference AB A B x1 x2 AB = x2 - x1 HW pg. 12 #6­11, 13­17, 24­27 2
  • 3. 1.2 Segments and Congruence August 15, 2011 HW pg. 12 #6­11, 13­17, 24­27 3
  • 4. 1.2 Segments and Congruence August 15, 2011 Segment Addition Postulate: If B is between A & C, then AB + BC = AC. *between: the point in the middle of 2 collinear points on the same line A B C AC A B C AB BC HW pg. 12 #6­11, 13­17, 24­27 4
  • 5. 1.2 Segments and Congruence August 15, 2011 HW pg. 12 #6­11, 13­17, 24­27 5
  • 6. 1.2 Segments and Congruence August 15, 2011 HW pg. 12 #6­11, 13­17, 24­27 6
  • 7. 1.2 Segments and Congruence August 15, 2011 HW pg. 12 #6­11, 13­17, 24­27 7
  • 8. 1.2 Segments and Congruence August 15, 2011 Find Length of GH 36 F G H 21 FH = FG + GH (Segment Addition Postulate) 36 = 21 + GH 36-21 = GH 15 = GH Congruent Segements: line segments w/ same length   Equal Congruent A B C D AB = CD  AB ≅ CD  HW pg. 12 #6­11, 13­17, 24­27 8
  • 9. 1.2 Segments and Congruence August 15, 2011 HW pg. 12 #6­11, 13­17, 24­27 9
  • 10. 1.2 Segments and Congruence August 15, 2011 HW pg. 12 #6­11, 13­17, 24­27 10
  • 11. 1.2 Segments and Congruence August 15, 2011 HW: p 12 # 6-11 13-17 24-27 HW pg. 12 #6­11, 13­17, 24­27 11