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1580 : {2x(3x+2)x14} + {2x(3x+2)x15} + (2x15x14)
: {2x(42x+28)}+{2x(45x+30)}+420
: 84x+56+90x+60+420
: 174x+116+420
: 174x+536
: 174x=1580-536
174x=1044
x=6
p=3x6+2
p=20cm
volume kubus:pxlxt
:20x15x14
:b.4200cm³