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2014-05-13T15:44:23+03:00
P=l+l+L+L=112
2l+2L=112 /:2
l+L=56
l/2=L/5
5l=2L
l=2L/5

2L/5+L=56
2L+5L=280
7L=280
L=280:7
L=40

l=2*40/5
l=80/5
l=16

Arie=l*L
Arie=16*40
Arie=640
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