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sudut AOB=60 derajat
sudut COD=80 derajat
panjang AB=12 cm
ditanya:
panjang CD
maka :
AOB per 12 ×COD per (tanda tanya)
60 per 12×80(tanda tanya)
⇒perkalian silang
60=12×80 per 60
12×8 per 6
⇔16 cm .D.
semoga membantu !