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Ls kerucut = 2.198
phi x r x s = 2.198
3,14 x r x (15+r) = 2.198
3,14r x (15r+r²) = 2.198
47,1 r² + 3,14 r^3 - 2.198 = 0
15 r² + r^3 - 700 = 0