Răspunsuri

2014-04-13T17:28:35+03:00
Folosim teorema fundamentala a asemanarii
SL ΙΙ ED⇒ΔHSL≈ΔHED    ⇒

⇒HS/HE=HL/HD=SL/ED
17/17+18 =HL/HD =10/ED
17/35=10/ED
ED=35*10/17=350/17
2014-04-13T17:39:21+03:00
20.5 cm [ raspuns prea scurt, raspuns prea scurt ] 
abia acum am vazut ca a mai raspuns cineva, scuze.