Odpowiedź:
[tex]a) 20^{2} +21^{2}=x^{2}[/tex]
[tex]400+441 = x^{2}[/tex]
[tex]x=\sqrt{841}[/tex]
[tex]x = 29[/tex]
obw. 20 + 21 + 29 = 70
P = [tex]\frac{21*20}{2} = 210[/tex]
b) [tex]2^{2}+(2\sqrt{3}) ^{2} =x^{2}[/tex]
[tex]4 +12 = x^{2}[/tex]
[tex]x = \sqrt{16}[/tex]
[tex]x=4[/tex]
obw. [tex]2 + 4 + 2\sqrt{3} = 6 + 2\sqrt{3}[/tex]
P = [tex]\frac{2*2\sqrt{3} }{2}[/tex] = [tex]2\sqrt{3}[/tex]
Pozdrawiam, miłego wieczoru
