b) Aria unei fete=4x3=12dm²
Aria laterala=3*12=36dm²
Aria bazei=l²√3/4=16√3/4=4√3dm²
Aria sticlei=36dm²+4√3dm²=42,92dm²=0,4292m²
Pretul sticlei=0,4292m²x50,5=21,6746 lei<22lei
c)V=araia bazeixinaltimea
V=17,3l=17,3 dm³
inaltimea apei=V/aria bazei=17,3dm³/4√3dm³=2,5dm
