Question

Dau multe puncte!!!!

Answer 1

AC/AO=BC/BO

20/AO=10/7

AO=20*7/10=140/10=14 CM 

OC = AC-AO=20-14=6 CM

Answer 2

DC║AB  T.T.H.⇒$\frac{DO}{OB} = \frac{OC}{OA} = \frac{3}{7} = \frac{OC}{AO} =\ \textgreater \ \frac{3}{3+7}= \frac{OC}{OC+OA}=\ \textgreater \ \frac{3}{10} = \frac{OC}{AC} =\ \textgreater \ OC= \frac{3*20}{10}=$=6 =>AO=AC-OC=20-6=14

BAFTA!