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K = 28
K = 2p + 2l
28 = 2(2+l) + 2l
28 = 4 + 2l + 2l
28 = 4 + 4l
28 - 4 = 4l
24 = 4l
l = 6 cm
p = 2 + l
p = 2 + 6
p = 8 m
L = p·l
L = 8·6
L = 48 cm²
28 = 2 (2+l) +2l
28 = 4 +2l +2l
28 - 4 = 4l
24 = 4l
6 = l
p = 2+6 = 8
L = 6 x 8 = 48