Question

In triunghiul ABC,D€(AB),E€(BC),DE||AC și BD=16cm,AB=28cm si EC=9cm,calculati AD,BE si BC!DAU COROANA!!

Answer 1

AD=AB-BD=28-16=12

BE/EC=BD/DA ( thales)
BE/9=16/12=4/3
BE/9=4/3⇒BE=12

BC=BE+EC=12+9=21

Answer 2

DE║AC⇒ (Thales)BD/DA-BE/EC  DA=28-16  DA=12     16/12=BE/9⇒BE=16*9/12 BE=`12