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kell roda = 628m/500 = 1,256m = 125,6 cm (A)
11)
Luas AOB / sudut AOB = Luas BOC / sudut BOC
154/3 / 120 = Luas BOC/ 150
154/3 / 4 = Luas BOC / 5
154/12 × 5 = Luas BOC
770/12 = Luas BOC
Luas BOC = 385/6 (C)