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37,68 = 1/3.3,14.3^2.t
37,68 = 9,42.t
t = 37,68/9,42
t = 4 m
s^2 = 3^2 + 4^2
s^2 = 9 + 16
s^2 = 25
s = 5
L permukaan kerucut = phi.r.s = 3,14.3.5 = 47,1 m^2