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2πr × t
2 × 22/7 × r ×12 = 528
44/7 × 12 × r = 528
528/7 × r = 528
r = 528 : 528/7
r = 7 cm
luas permukaan tabung
2 luas alas + luas selimut tabung
2πr² + 528
2 × 22/7 × 7 × 7 + 528
44/7 + 528
= 3740/7 = 534,2857 cm²