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251,2 = 2 x 3.14 x r
r = 40 cm
s² = r² + t²
50² = 40² + t²
t² = 2500 - 1600
t² = 900
t = 30 cm
volume kerucut = 1/3 x πr² x t
= 1/3 x 3.14x 40 x 10 x 30
= 12560 cm³