Given aabc. m la= 39°
mlb=104°
ac= 20cm
mlc=
ab =
cb -

∠C = 37° ,

AB = 26.54 cm ,

BC= 33.27 cm

Step-by-step explanation:

Given that in triangle ABC

∠A = 39°                       AC = 20 cm

∠B = 104°

∵ sum of all the three angles of triangle = 180°

So,    ∠C = 180° - ( ∠A + ∠B)

         ∠C = 180° - (39° + 104°)

         ∠C = 37°

Now Tan 37° =

    Or, AB =  

    So, AB = 26.54 cm

Again, Sin 37° =

       So, BC =

       Or, BC =

        ∴   BC= 33.27 cm

Hence ∠C = 37° , AB = 26.54 cm , BC= 33.27 cm       Answer

Time spent with paul : 1/8 h
Total time spent chatting with friends: 2/3h+1/4h=11/12 h

The fraction of the time she spent with paul is (time spent with paul)/(total time spent chatting)

 hence the fraction spent with paul is  (1/8)/(11/12)=3/11