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2014-03-17T22:21:12+07:00
Busur AB/sudutAOB=busur CD/sudutCOD
AB/120=30/45
AB/40=2/1
AB=2.40
AB=80
jadi, busur AB adalah 80cm
1 5 1
2014-03-17T22:25:02+07:00
 \frac{CD}{DOC} =  \frac{AB}{AOB} =
 \frac{30}{45} =  \frac{AB}{120}

30x120 = 45AB
AB = 360/45 =  8^{o}
tolong dikoreksi..