Bantuin dong, agak bingung ​

v = π × r² × t

v = 22/7 × (30 ÷ 2)² × 28 cm

v = 22 × 15 cm × 15 cm × 4 cm

v = 22 × 15 cm × 60 cm²

v = 22 × 900 cm³

v = 19.800 cm³