Răspunsuri

2014-02-17T21:20:42+02:00
Daca BD = 40 cm si DC = 4 cm, folosesti T. inaltimii si afli pe AD = 4 \sqrt{10}
cm;
ai ca BC = 44 cm; aria(ABC) = (AD*BC)/2 = 88 \sqrt{10}  cm^{2} ;
Bafta!
1 5 1
2014-02-17T21:32:57+02:00
Cu teorema inaltimii⇒AD²=BD·DC=4·40=160⇒AD=4√10 cm
BC=BD+DC=44 cm
A_{ABC}=\dfrac{BC\cdot AD}{2}=\dfrac{44\cdot 4\sqrt{10}}{2}=88\sqrt{10}\ cm^2