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31,4=2×3,14×r
31,4=6,28×r
r=31,4÷6,28
r=5
t=√13²-5²
t=√169-25
t=√144
t=12
V=⅓×pi×r²×t
V=⅓×3,14×5×5×12
V=⅓×15,7×60
V=⅓×942
V=942÷3
V=314