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= 2.πr² + 2πrt
= 2πr (r+t)
596,6 = 2.(3,14).5 (5+t)
= 31,4. (5+t)
596,6 = 157 + 31,4t
31,4 t = 596,6-157
= 439,6
t = 439,6 / 31,4
= 14 cm