T=12 D=18 tolong yah pake cara...

V = phi × r^2 × T

= 3,14 × 9^2 × 12

= 3,14 × 81 × 12

= 254,34 × 12

= 3.052,08

V= π×r²×T
V=3,14×9²×12
V= 3,14×81×12
=3.052,08

maaf kalau salah