V=a*b*c
a*b=8,41
a*c=12,96
b*c=15,21
…
a=\frac{8,41}{b}
c=\frac{12,96}{a}
b=\frac{15,21}{c}
b=\frac{15,21}{\frac{12,96}{a}}=\frac{15,21*a}{12,96}=1,17a
…
a= \frac{8,41}{b}
a=\frac{8,41}{1,17a}
a^2=\frac{8,41}{1,17}
a^2=7,2
a=2,68
…
c=\frac{12,96}{a}
c=\frac{12,96}{2,68}
c=4,84
…
b=\frac{15,21}{c}
b=\frac{15,21}{4,84}
b=3,14
…
V=a*b*c
V=2,68*3,14*4,84
V\approx40,73m^3