Odpowiedzi

2009-12-07T16:34:55+01:00
20 cm = 2dm = a
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