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= TT r2 20:3
= 22/7 x7x7x20:3
= 22.7.20:3
= 154.20:3
= 3080:
=1026,6
= 1/3 × × r² × t
= 1/3 × 22/7 × 7² × 20
= 1/3 × 22/7 × 49 × 20
= 1/3 × 22 × 2 × 20
= 880/3
= 293,33 cm³