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3). V = ⅓ × p × l × t
= ⅓ × 15 × 12 × 40
= 5 × 12 × 40
= 2.400 dm³
4). V = 4/3 × π × r³
= 4/3 × 22/7 × 21 × 21 × 21
= 4/3 × 22 × 3 × 21 × 21
= 4 × 22 × 21 × 21
= 38.808 m³
3). V = ⅓ × p × l × t
= ⅓ × 15 × 12 × 40
= 5 × 12 × 40
= 2.400 dm³
4). V = 4/3 × π × r³
= 4/3 × 22/7 × 21 × 21 × 21
= 4/3 × 22 × 3 × 21 × 21
= 4 × 22 × 21 × 21
= 38.808 m³