va rog mult urgent am nevoie

Va Rog Mult Urgent Am Nevoie class=

Răspuns :

Sper sa iti dai seama unde sa pui teoremele.
BC^2=AC^2+AB^2
AB=18 cm
Aabc=(AC*AB)/2=216cm^2

AC^2=BC*CD=>CD=19,2cm
=>BD=30-19,2=10,8cm
AD^2=19,2*10,8=207,36
AD=14,4CM
Aabd=(14,4*10,8)/2=77,76cm^2
Aacd=(14,4*19,2)/2=138,24cm^2
Aabd/Aacd=0,5625