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