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p/l = 5/4
p=5l/4
k= 2p + 2l
54 = 2(5l/4) + 2l
54 = (10l/4) + 2l
54 = (5l/2) + (4l/2)
54 = (9l/2)
108 = 9l
l = 12
p=5l/4
p=5*12/4
p=15
L=p*l
L=15*12
L=180 m²