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11/(11+7) ×180°
11/18 ×180°
110°
sudut y=180°-110°=70°
besar sudut z
sudut z =x-y
sudut z =110°-70°
sudut z =40°
x : y = 11 : 7
x - y = (11-7)/(11+7) x 180 = 4/18 x 180= 40