Jawabanmu

2014-05-29T08:18:54+07:00
12/108 x 360=40°
jadi,sudut AOB sebesar 40°
2014-05-29T08:19:16+07:00
12 = x/360 x 108
1 = x/360 x 9
9x = 360
x= 40
jadi sudutnya 40 derajat