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2014-05-20T15:11:13+03:00
P=90
l+l+L+L=90
2l+2L=90 /:2
l+L=45
L=2l
l+2l=45
3l=45
l=45:3
l=15

L=2*15
L=30
3 4 3
2014-05-20T15:14:44+03:00


L_______|________| 

l________                                =90m

90:3=30(m are l)

30X2=60(m are L)

Succes

1 5 1