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k = 2 phi r
251,2 = 2. 3.14. r
r = 251,2/ 6,28
r = 40
tinggi^2 = 50^2 - 40^2
= 2500 - 1600
t = akar dari 900
t = 30 cm
v = 1/3 phi r^2 t
= 1/3 3,14 .40^2. 50
= 83733,34 cm^3