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81 = 16 + s
65 = s
t = √65^2 - 16^2 = √3969 = 63 cm
V = 3,14 x 1/3 x 63 x 16 x 16 = 16880,64 cm3
4069,44 = 3.14 x 16 x (16 + s)
4069,44 : 3.14 : 16 = 16 + s
81 = 16 + s
s = 81 - 16
s = 65
t = √s2 - r2
t = √4225 - 256
t = √3969 = 63 cm
Volume Kerucut = 1/3 πr2t
= 1/3 x 3.14 x 16 x 16 x 63
= 16880,64 cm3