в ΔABD: <ADB=30; AB=0.5BD=6
AD=BD*sin60=12*√3/2=6√3
CD^2=AD^2+AC^2
AC^2=CD^2-AD^2=172-108=64
BC^2=AB^2+AC^2=6^2+64=100
BC=10
в ΔABD: <ADB=30; AB=0.5BD=6
AD=BD*sin60=12*√3/2=6√3
CD^2=AD^2+AC^2
AC^2=CD^2-AD^2=172-108=64
BC^2=AB^2+AC^2=6^2+64=100
BC=10