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= πr² + 2πrt + 2πr²
= (3.14 x 12 x 12) + (2 x 3.14 x 12 x 20) + (2 x 3.14 x 12 x 12)
= 452.16 + 1507.2 + 904.32
= 2863.68 cm² (D)