Răspunsuri

2014-04-09T20:21:20+03:00
BC, AA' d.p cu 3,5 ⇒ BC/3=AA'/5=k
BC=3k
AA'=5k
AA'=BC+4
5k=3k+4
5k-3k=4
2k=4
k=2
BC=3*2=6
AA'=5*2=10

A=b*h/2=6*10/2=30 cm