[tex] \frac{ab}{bc} = \frac{7}{25} \\ \frac{7}{bc} = \frac{7}{25} \\ bc = \frac{7 \times 25}{7} = 25[/tex]
[tex] {ac}^{2} = {25}^{2} - {7}^{2} = 625 - 49 = 576[/tex]
[tex]ac = \sqrt{576} = 24[/tex]
[tex]cos \: c = \frac{ac}{bc} = \frac{24}{25} [/tex]
[tex]tg \: b = ctg \: c = \frac{24}{7} [/tex]
