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v=1/3. phi. r² . t
144= 1/3. 3,14. r² . 12
12=1/3. 3,14 r²
36=3,14. r²
r= √( 36 ÷ 3,14 )
r=6 ÷ √3,14
r=6√3,14 / 3,14
r=3√3,14 / 1,57