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Verified answer
T = 12 cmd = 28 cm
Lpt = (2 × La) + (Lselimut)
Lpt = (2×1/4×phi×d^2) + (phi×d×t)
Lpt = (2×1/4×22/7×28^2) + (22/7×28×12)
Lpt = 1232 + 1056
Lpt = 2288 cm^2
Jadi luas permukaan kaleng tersebut adalah 2288 cm^2