Răspunsuri

2014-05-12T20:08:38+03:00
ΔABC, mas<A=90

BC²=AC²-AB²= 20²-16²= 400-256=144   ⇒BC=14

A=L*l=16*14=224
2014-05-12T20:10:00+03:00
Adreptunghi=Lxl=Se cunoaste L=16 cm . Intr-un dreptunghi,diagonalele se injumatatesc => l=20 supra 2=10 . A=Lxl= 10x16=160 cm . Bafta.