1) ( c = \sqrt{a^2 + b^2} = \sqrt{6^2 + 8^2} = \sqrt{36 + 64} = \sqrt{100} = 10 ) см

2) ( c = \sqrt{(2a)^2 + b^2} = \sqrt{1^2 + 1^2} = \sqrt{1 + 1} = \sqrt{2} ) м

3) ( c = \sqrt{a^2 + b^2} = \sqrt{\left(\frac{3}{11}\right)^2 + \left(\frac{4}{11}\right)^2} = \sqrt{\frac{9}{121} + \frac{16}{121}} = \sqrt{\frac{25}{121}} = \frac{5}{11} ) дм

4) ( c = \sqrt{a^2 + b^2} = \sqrt{2,3^2 + 4^2} = \sqrt{5,29 + 16} = \sqrt{21,29} \approx 4,61 ) см