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Peny =
V =1/3 × pi r^2 × t
1/3 × 22/7 × 7^2 × 12
1/3 × 22/7 × 49 × 12
1/3 × 154 × 12
154 × 4
616 cm^3
=1/3 x 22/7 x 7 x 7
= 154/3
= 51,33 cm2
kayaknya sih gitu