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Un pentagon are aria 600 cm patrati .Aflati cat are latura

Răspuns :

[tex]A(pentagon)=\frac{\sqrt{25+10\sqrt{5}}}{4}*l^{2}\\ \\600=\frac{6,88}{4}*l^{2}\\\\2400=6,88*l^{2}\\\\l^{2}=2400/6,88=348,84\\\\l=\sqrt{348,84}=18,67~cm[/tex]

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