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2014-10-16T20:43:26+03:00
Promb = 4l
Promb = 4 x 6,25 = 25 cm
Pdr = 2x Promb = 50 cm
4l=L
50 = 2(L+l)
25 = 4l+l
5l = 25 => l= 5 cm
L=4x5 = 20 cm
3 5 3