lp. tabung = 2 × π × r × (r + t)
= 2 × 3,14 × 10 × (10 + 20)
= 62,8 × 30 = 1.884 cm² = C
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lp. tabung = 2 × π × r × (r + t)
= 2 × 3,14 × 10 × (10 + 20)
= 62,8 × 30 = 1.884 cm² = C