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maka sudut pusat AOD kecil = 2x
jadi sudut AOD besar = 360-2x
jumlah sudut AODB = 360 (segi empat)
80 + x + 360-2x = 360
-x = 360-360-80
-x = -80
x = 80
sudut AOD besar = 360-2x = 360-160 = 200
sudut keliling ACD = 1/2 sudut AOD besar = 1/2 x 200 = 100 derajat (A)
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4. sudut AOD besar = 360-(2x70) = 360-140 = 220
Sudut BAC = 360 - (70+30+220) = 360-320 = 40 (B)