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2014-10-27T17:31:48+02:00
L=100cm
l=20%xL=20/100x100=20cm

P=2(L+l)=2(100+20)=2x120=240cm
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2014-10-27T17:32:07+02:00
L=20/100*100
l=20cm
P=2l+2L
P=2*20+2*100
P=40+200
P=240 cm
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