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1/2x + 1/2x = 80˚
x = 80˚
maka sudut pusat AOD = 2.80˚ = 160˚
sudut refleks AOD = 360 -160 = 200˚
jadi,sudut ACD = sudut keliling = 1/2.sudut refleks AOD = 1/2.200˚ = 100˚ jawabannya (A)