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p - l = 2 m
l = p - 2
K = 2p + 2l
28 = 2p + 2(p -2)
28 = 2p + 2p - 4
28 + 4 = 4p
32 = 4p
p = 32/4
p = 8
l = p - 2
l = 8 -2 = 6
L = p × l
L = 8 × 6 = 48 m2