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            CHAPTER 1

             BASIC CONCEPTS OF TRIGONOMETRY




            1.1 Trigonometric Comparison in Right Triangle

                        Hypotenuse/   b           The side in front


                    hypotenuse


                                             a   of the corner
                   A                        B
                                  c
                       The side near the corner
                        
            Trigonometric comparisons are ratios or ratios between the
            sides  of  a  right  triangle,  for  example  between  the  side
            opposite the angle and the hypotenuse, between the side
            near  the  angle  and  the  hypotenuse,  between  the  side
            opposite the angle and the side near the angle, and so on.

            1.2  Sine,  Cosine,  Tangent,  Cotangent,  Cecan  and
            Cosecant

                                            C



                                          
                                b
                                             a

                     A                      B
                                  c
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