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2 x 3,14 x r = 251,2
6,28 x r = 251,2
r = 40cm.
s = 50 cm.
t = 30cm(phytagoras)
V kerucut = 1/3 x πr²t
= 1/3 x 3,14 x 40 x 40 x 30
=50,240 cm³.