Răspuns :
diagonala = l√2 ⇒ latura= [tex] \frac{diagonala}{ \sqrt{2} } = \frac{4}{ \sqrt{2} } = \frac{4 \sqrt{2} }{2} =2 \sqrt{2} [/tex] (latura)
aria= l²
= (2√2)²
= 8
aria= l²
= (2√2)²
= 8