[QUOE="Dun-Gtj, post: 3237449, member: 2555637"]a) [tex]BC^{2}=AB^{2}+AC^{2}[/tex]
=> AC = 28
b) [tex]AH \times BC = AB\times AC[/tex]
=> AH = 16.8
AM = [tex]\frac{1}{2}BC[/tex] = 17.5
[tex]AC^{2}=CH\times CB[/tex]
=> CH = 22.4
Good luck[/QUOTE]
Cảm ơn bạn, còn AD thì sao