Question

In triunghiul ABC construim DE pararel cu BC,d aprtine dreptei AB,e apartine drepteiAC,AD=2cm,DB=5cm,EC=10cm.Atunci AB si AE au lungimile de :

Answer 1

DE II BC⇒T,th $\frac{AD}{DB} = \frac{AE}{EC}$⇒$\frac{2}{5} = \frac{AE}{10}$⇒AE=$\frac{2x10}{5}$=4 cm
AB=AD+DB⇒AB=2+5=7cm