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2014-04-24T21:22:41+03:00
L=L/4

L+L+l+l=20
2L+2l=20
2(l+L)=20
l+L=20:2=10

L/4+L=10
L+4L=40
5L=40
L=40:5
L=8

l=8/4
l=2

Aria=l*L
Aria=8*2
Aria=16
3 5 3