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2014-10-20T19:05:02+03:00
BD≡CD
m(ung.CBD)≡m(ung.CDB)=120/2=60 grade
m(ung.C)=180-60-60=60 grade⇒
ΔCBD≡ΔCDB-triunghi echilateral
BC≡DC≡DB=12 cm