Page 3 - Lesson Notes
P. 3

  `triangle ABC`, or
                                  `triangle BCA`,
                                  `triangle CAB`


                                3 sides:  AB, BC,
                                  CA
        Elements of a            3 angles: ∠ABC,
        triangle                  ∠BCA, ∠CAB
        ( Fig-4.21)             3 vertices: A, B, C


        Interior and            Point  P is interior of
        Exterior of               the triangle.
        Triangle.               Point  R is exterior
                                  of the triangle
                                Point  Q is on the
                                  triangle

















































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