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62,8=3,14.d
d=20
r=10cm
V=1/3.phi.r.r.t
V=1/3.3,14.10.10.12
V= 1256 cm kubik
k = phi x d
62,8 = 3,14 x d
d = 20 => r = 10
v kerucut = 1/3 phi r^2 t
v = 1/3 3,14 10^2 12
v = 1256