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2014-05-20T11:07:33+03:00
L=4l
P=l+l+L+L=24.4
2l+2L=24.4  /:2
l+L=12.2
l+4l=12.2
5l=12.2
l=2.44

L=2.44*4
L=9.76
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2014-05-20T11:07:58+03:00
L=4l
P=L+L+l+l=2(L+l)=24.4
2(4l+l)=24.4
5l=12.2⇒l=2.44 m, L=4l=9.76 m
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