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2014-05-12T19:20:48+03:00
2(L+l)=160
L+l=80
L+3/4L=80
7/4L=80 |*4
7L=320
L=45.7
l=3/4L = 3/4* 45.7 = 34.2
A= L*l= 45.7*34.2 = 1562.94

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