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2cm=20 mm
1 dm = 100 mm
V= 20 mm * 100mm* 5mm
V= 10000mm³
P= 2 * ( 20*5) + 2* (5*100) + 2 * (20*100)
P=200 + 1000 + 4000
P=5200 mm²
b)
V= a³
V= (2√2)³
V= 22,6 cm³
P= 6a²
P= 6* (2√2)²
P=48 cm²