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maka besar sudut BPC = 20 derajat
rumus panjang busur AB adalah :
sudut APB/sudut BPC = busur AB/busur BC
70/20 = AB / 30
7/2 = AB/30
2AB = 210
AB = 210/2
AB = 105 cm
jadi panjang busur AC = panjang busur AB + panjang busur BC = 105 + 30 = 135 cm