Odpowiedź:
1)
x + x + 3 = 26
2x = 23
x = 11,5
x + 3 = 11,5 + 3 = 14,5
P = 11,5 * 14,5
P = 166,75
2)
Długość przekątnej kwadratu: [tex]a\sqrt{2}[/tex]
[tex]a\sqrt{2} = 8[/tex]
[tex]a = \frac{8}{\sqrt{2}}[/tex]
[tex]a = \frac{8\sqrt{2}}{\sqrt{2}*\sqrt{2}} = \frac{8\sqrt{2}}{2} = 4\sqrt{2}[/tex]
[tex]Obw = 4 * 4\sqrt{2} = 16\sqrt{2}[/tex]
[tex]P = (4\sqrt{2})^{2} = 16 * 2 = 32[/tex]