9 2 line segments, rays, and angles 2
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9 2 line segments, rays, and angles 2 9 2 line segments, rays, and angles 2 Presentation Transcript

  • LINE SEGMENTS, RAYS, AND ANGLES
    Topic 9
    Lesson 9-2
  • LINE SEGMENTpart of a line with two endpoints
    A
    B
  • Name a line segment?
    E
    F
    G
    H
    J
    View slide
  • Were you correct?
    EF
    G J
    H
    Answers could be: EG, GE, GF, FG, GJ, JG, GH, HG, EJ, JE, HF, FH
    View slide
  • RAYa part of a line that has one endpoint and continues on forever in one direction
    C D
  • ANGLEa figure formed by two rays that have the same endpoint
  • There are 4 types of angles.
    obtuse straight
    acute right
  • RIGHT ANGLEis a square corner and equals 90 degrees
  • STRAIGHT ANGLEforms a straight line and is equal to 180 degrees
  • ACUTE ANGLEis less than a right angle or less than 90 degrees
  • OBTUSE ANGLEis greater than a right angle or greater than 90 degrees
  • VERTEXthe common endpoint of the two rays that form the angle
    When naming an angle, name the points in the correct order with the vertex of an angle always in the middle.
    Example: PQT
    PQ S
    U
    R T
  • Name an acute angle.
    EF
    G
    H J
  • Did you get . . .
    EGHorFGJ
  • Name an obtuse angle.
    E F
    G
    J
    H
  • Did you say . . .
    EGF or HGJ
  • To name a straight angle you would say …
    C D E
    C D E
  • Now you understand line segments, rays, and angles!
    Time to tackle your homework.