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= 1/3 π.r²t
= 1/3.3,14.9².12
=1/3.3052
=1017.36
^t=12
t=
= 225 - 81
= 144 = 12
v= 1/3 × π
= 1/3 × 3,14 × 9 × 9 × 12
= 1017.36