Ex 2 rapid va rog mult e urgent
![Ex 2 Rapid Va Rog Mult E Urgent class=](https://ro-static.z-dn.net/files/d85/b01832f77fe4e5763782bbc516f0af71.png)
DO=OB=OC=AO=12,5 mm
Perimetrul triunghiului CDO: 12,5mm+12,5mm+18mm=43mm
43mm=4,3cm