Aria dreptunghi = lungime * latime
lungimea = 2.5 * latime
Aria = 90m^2
Inlocuim in prima reltaie => 90 = 2.5 * latime^2
=> latime^2 = 90 : 2.5 => latime^2 = 36 => latime = radical(36) => latime = |6| = 6
=> lungime = 2.5 * 6 => lungime = 15
Raspuns: B
