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Un patrat are aria suprafetei 60 cm patrati. Ce lungime are latura sa?

Răspuns :

A = l²
l = √A = √60 = 2√15cm 
[tex]A_{patrat}=l^{2}[/tex]

[tex]A_{patrat}=60cm^{2}[/tex]

[tex]=>l^{2}=60cm^{2}[/tex]

[tex]=>l=\sqrt{60}[/tex]

[tex]60=2^{2}*3*5[/tex]

[tex]=>l=\sqrt{2^{2}*3*5}[/tex]

[tex]=>l=2\sqrt{3*5}[/tex]

[tex]=>\boxed{l=2\sqrt{15}(cm)}[/tex]