1) S=2(15*9)+2(15*6)+2(9*6)
2) S=2(3,2*4,4)+2(3,2*7,8)+2(4,5*7,8)
3) S=2(1,25*0,8)+2(1,25*2,4)+2(0,8*2,4)
1) S=2(15*9)+2(15*6)+2(9*6)
2) S=2(3,2*4,4)+2(3,2*7,8)+2(4,5*7,8)
3) S=2(1,25*0,8)+2(1,25*2,4)+2(0,8*2,4)