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p=7l/5....(1)
K= 2(p+l)
240=2(7l/5+l)
240/2=12l/5
120=12l/5
12l=600
l=600/12=50 cm
Dit:l?
240=2(7x+5x)
120=12x
x=10
l=5x
l=5x10
l=50cm