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p = 12 cm
K = 2 ( p + l )
40 cm = 2 ( 12 + l )
20 = 12 + l
l = 20 - 12 = 8 cm
L = p x l
L = 12 x 8
L = 96 cm²
p = 12 cm
K = 2 ( p + l )
40 cm = 2 ( 12 + l )
20 = 12 + l
l = 20 - 12 = 8 cm
L = p x l
L = 12 x 8
L = 96 cm²