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2014-06-09T12:29:23+03:00
L*l=135
l=3/5*L
L*3/5*L=135
L²*3=(135*5)
L²=675/3
L²=225
L=15
l=3/5*L=3/5*15=3*3=9
P=2(L+l)=2(15+9)=2*24=48cm²