1. AC^2 = BC^2 + AB^2 = 4^2 + 6^2 = 16 + 36 = 52
AC = (racine de 52) ~ 7,21
2. AC^2 = BC^2 - AB^2 = 4^2 - 2^2 = 16 - 4 = 12
AC = (racine de 12) ~ 3,46
3. AC^2 = AB^2 + BC^2
AD^2 + BD^2 = AB^2 = 3^2 + 3^2 = 18
AC^2 = 18^2 + 18^2 = 648
AC = (racine de 648) ~ 25,46