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3 dm = b
500mm = 50 cm = 5 dm = c
V = a*b*c
V = 2*3*5
V = 30 dm ^3
Pc = 2 * ( 2* 3) + 2 * ( 3*5) + 2 * (2 *5) = 12+30 +20= 62 cm ^2