[tex]Mai\ intai\ calculam\ aria\ locului\ de\ joaca,\ dupa\ care\ o\ impartim\ la\ aria\ unei\ dale.\\\\A_{loc\ de\ joaca}=l*L,\ unde\ l=latimea\ si\ L=lungimea\\\\A_{loc\ de\ joaca}=30*12=360dm^{2}\\\\A_{dala}=l^{2},\ unde\ l=latura\\\\A_{dala}=3^{2}=9dm^{2}\\\\A_{loc\ de\ joaca}:A_{dala}=360:9=40\ de\ dale[/tex]
