Răspunsuri

2014-05-05T17:30:30+03:00
P=l+l+L+L
2l+2L=90
2(l+L)=90
l+L=45
L=2l
l+2l=45
3l=45
l=45:3
l=15

L=2*15
L=30
61 3 61
2014-05-05T17:39:47+03:00
P=90m
p unui dreptunghi=2*L+2*l
90=2*L+2*l
90=2L+2l
L=2*l
L=2l
2L=2l+2l
2L=4l
inlocuim
90=4l+2l
90=6l
90/6=l
l=15
L=4l
L=15*4
L=60/2
L=30
l=15      L=30

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