1)
AD^2 =BD*BC
6^2 =2^2*BC
36=4 BC
BC =36:4 =9
cm
AC^2 =BC^2-AB^2
AC^2 =9^2-6^2 =81-36 =45
AC = radical 45 =3 rad 5 (6.70 cm)
DC =BC-BD =9-2 =7 cm
AD^2 =BD*DC
AD^2 =2*7 =14
AD = rad 14 =3.74 cm
FORMULE UTILE
h =AB*AC/BC
h ^2 =BD*DC
h =C*C/ ipotenuza
AB^2 =BC+BD
AC^2 =BC*DC
Aria =C*C/2
A=BC*h/2
A =AB*AC/2
........