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785 liter = 3,14 × 50² × t
785.000 cm³ = 7.850 × t
t = 785.000 : 7.850
t = 100 cm
Luas sisi tabung tanpa tutup = π × r² + 2 × π × r × t
= 3,14 × 50² + 2 × 3,14 × 50 × 100
= 7.850 + 31.400
= 39.250 cm²