Odpowiedź:
a) romb
[tex]a = \sqrt{8^{2} + 3^{2}} = \sqrt{73}[/tex]
Obw = 4a
[tex]Obw = 4 * \sqrt{73} = 4\sqrt{73}[/tex]
b) prostokąt
20² = (3x)² + x²
400 = 9x² + x²
400 = 10x²
x² = 40
[tex]x = \sqrt{40} = 2\sqrt{10}[/tex]
[tex]3x = 6\sqrt{10}[/tex]
Obw = 2* (a + b)
[tex]Obw = 2 * (2\sqrt{10} + 6\sqrt{10}) = 2 * 8\sqrt{10} = 16\sqrt{10}[/tex]
