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2014-06-13T01:53:51+03:00
P=4l
P=400

4l=400
l=100

l dreptunghi = 2/5 din 100= 2/5*100= 2*20=40

L=3l=3*40=120

P=2l+2L=2*40+2*120= 80+240= 320
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