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2014-02-25T00:12:03+07:00
B : F : C = 12 : 19 : 5     .... BFC suatu segitiga maka jmlah sudut-sudutnya = 180
(12 + 19 + 5)x = 180
36 x = 180
x = 180/36 = 5
sudut FBC = 12 . 5 = 60
sudut FCB = 5 . 5 = 25
sudut COE = 2 x sudut FBC = 2 x 60 = 120
sudut BOD = 2 x sdt FCB = 2 x 25 = 50
sudut DAC = (sudut COE - sudt BOD) : 2
                 = (120 - 50) : 2
                 = 35