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Verified answer
1) Luas permukaan tabung= 2 x π x r ( r + t )
= 2 x 22/7 x 7 cm ( 7 cm + 4 cm )
= 44 cm x 11 cm
= 484 cm²
2) Luas selimut tabung
= 2 x π x r x t
= 2 x 22/7 x 14 cm x 28 cm
= 2.464 cm²