Răspunsuri

2014-05-17T18:34:40+03:00
L-4=l
P=2l+2L=40

2(L-4)+2L=40
2L-8+2L=40
4L=40+8
4L=48
L=12
l=12-4=8

V=L*l*h=8*12*10=960 cm³
At=2(L*l+L*h+l*h)
=2(12*8+12*10+8*10)
=2(96+120+80)
=2*296
=592