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56 = 2 (4 + l + l)
56 = 8 + 4l
4l = 48
l = 12 cm
p = 12 + 4 = 16 cm
L = p × l
L = 16 × 12 = 192 cm^
a + b = 56 / 2
a + a + 4 = 28
2a = 28 - 4
2a = 24
a = 24 / 2
a = 12