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2014-08-09T14:27:34+03:00
0,25=25/100=1/4

A=L*l

l=1/4 *L

l=L/4

L*L/4=16

L²/4=16  <=> L²=4*16  =>L=√4*16= 2*4=8

l=8/4=2

P=2l+2L=2*2+2*8=4+16=20