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2014-03-13T21:17:21+02:00
60=L²+l²
l/L=3/4⇒L=4l/3⇒L²=16·l²/9 si inlocuim in prima egalitate
60=16·l²/9+l²
60·9=25·l²
l²=60·9/25
l=6/5√15cm
L=4l/3=8/5√15 cm