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2014-06-18T21:56:26+03:00
A=L*l
A=98

2l*l=98
2l²=98
l²=49    ⇒l=7   ⇒L=2*7=14

P=2l+2L=2*7+2*14=   14+28= 42
2014-06-18T23:16:56+03:00
A=L ori l
A=98

2l ori l=98
2l²=98
l²=49 .........  l=7   
L=2*7=14

P=2l+2L
2ori7+2ori14
 14+28= 42