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1dm=100mm
5mm
v=20*100*5=10000[mm³]
P=2*20*100+2(20+100)*5
P=4000+1200
P=5200[mm²]
b) a=1,2cm=12mm
v=a³
v=12³
v=1728[mm³]
P=6a²
P=6*12²
P=6*144
P=864[mm²]