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a=2cm
x=2/3 * (a^3)/2
x=(2^3)/2
H= x^3
H=(2^3)/2 * ^3
H=3
Pp = (a2 ^3)/4
Pp= (4^3)/4
Pp = ^3
V= 1/3 * H * Pp
V= 1/3 * 3 * ^3
V= ^3
rys. http://yfrog.com/28ostroslupp