Page 4 - qua2
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.11

                 .                   ABC         AD = BD
                    ABC                                    .180

               .                                                         .12
           C=

             .180°         CFOE
           + 180
                    = 180 / 180
                            = 0 /+
                            =

                                         =1      –1
           9| | 6 ∙ ( 1) = 24 / 6
            3| | 2 ∙ | 1| = 4 /+2

(| | = 2)           9| | = 18
                    3| | = 6

                                  3

                                                     .13

18 18
                    66

           18 + 0 + 6 12
               3 =3=

                                             .4

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