Odpowiedź:
a) Przekątna kwadratu = a[tex]\sqrt{2}[/tex] = 15[tex]\sqrt{2}[/tex] cm
b) a[tex]\sqrt{2}[/tex] = 18
a = [tex]\frac{18}{\sqrt{2} }[/tex] = [tex]\frac{18}{\sqrt{2} }[/tex] × [tex]\frac{\sqrt{2} }{\sqrt{2} }[/tex] = [tex]\frac{18\sqrt{2} }{2}[/tex] = 9[tex]\sqrt{2}[/tex] cm
