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k= 2(p+l)
58 = 2 (p+(p-5))
58 = 2 (2p - 5)
58/2 = 2p - 5
29 = 2p - 5
2p = 34
p = 17 cm
=> l = p - 5 = 17 - 5 = 12 cm
L = p x l = 17 x 12 = 204 cm²