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2 x 3,14 x r = 251,2
6,28 r = 251,2
r = 251,2 / 6,28
r = 40
r = 40, s = 50 maka t = 30 (Triple phytagoras 3,4,5)
V = 1/3 \pi r²t = 1/3 x 3,14 x 40 x 40 x 30 = 50240 cm³