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Verified answer
Luas permukaan = 2 x π x r ( r + t )517 cm² = 2 x 22/7 x 3,5 cm ( 3,5 cm + t )
517 cm² = 22 cm ( 3,5 cm + t )
3,5 cm + t = 517 cm² : 22 cm
3,5 cm + t = 23,5 cm
t = 23,5 cm - 3,5 cm
t = 20 cm