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816,4 = 3,14 . r . 26
260 = r . 26
r = 260 : 26
r = 10 cm
s² = t² + r²
26² = t² + 10²
676 = t² + 100
t² = 676 - 100
t² = 576
t = √576
t = 24 cm
V. Kerucut = 1/3 . n . r² . t
= 1/3 . 3,14 . 10 . 10 . 24
= 1/1 . 314 . 8
= 2512 cm^3