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6) sin 60 = 2√3 / AC                            7)  cos 60 = BD / 36
     √3                                                             0,5  = BD / 36
    ------   = 2√3 / AC                                      BD  = 0,5 x 36
       2                                                                    = 18 cm
                                                                 
     2                                                            sin 60 = AB / 36
   ------ x (2√3)   =  AC                                  √3
    √3                                                           -----   =  AB / 36 
    4 cm     =  AC                                            2
                                                                     AB  =  18√3 cm
 cos 45 =  AD / AC
    √2                                                           tan30 = (18√3) : (BD + DC)
   ----     =  AD / 4                                        0,5
     2                                                            -----   =  18√3 : (18 + DC)
                                                                   √3/2
   √2       1                                                   
  ----- : ----- =  AD                                         1              18√3
     2       4                                                   ----   =    -----------
                                                                    √3          18 + DC
  AD  = 2√2 cm                                         
                                                                     18 + DC = 18√3 x√3
                                                                              DC = 18 x 3 - 18
                                                                              DC = 36 cm