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2014-04-22T21:08:56+03:00
Perimetru patrat=4xl
4xl=90+l
4xl-l=90
3l=90
l=90:3
l=30

Perim=30x4=120
2 5 2
2014-04-22T21:09:31+03:00
A+a+a+a=a+90⇒4a=a+90
3a=90⇒a=30
Perimetrul = 4a⇒4*30=120