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2014-07-23T15:04:13+03:00
L/L= 4/5

l/20=4/5

l=20*4/5

l=4*4=16

P=2l+2L=2*16+2*20= 32+40=72 cm


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2014-07-23T15:04:30+03:00
Fie 
L-lungimea
l-latimea
l/l=4/5
L=20
l/20=4/5
5l=20*4
5l=80
l=80/5
l=16.
P=2L+2l=2*20+2*16=40+32=72
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