2×pi×r pangkat 2 + 2×pi×r×t
2×3,14×8×8 + 2×3,14×8×20
=1,406.72
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Verified answer
2×pi×r pangkat 2 + 2×pi×r×t
2×3,14×8×8 + 2×3,14×8×20
=1,406.72