Question

Fie triunghiul ABC,m(A)=90,AD_|_BC,D apartine BC. Stiind ca: a) BD=3 cm si CD=27 cm,sa se afle AD; b) AD=6 cm si BD=3 cm,sa se afle BC.

Answer 1

AD^2 =BD*DC
AD^2=3*27
AD^2 =81
AD =radical din 81 =9 cm

b)AD^2 =BD*DC
     6^2 =3* DC
36=3*DC
DC =36:3 =12cm

BC =BD+DC
BC =3+12 =15 cm