Question

499 5 пример помогите 50 баллов даю!!! Карл 50!

Answer 1

5)
$\cos( \beta ) = 9 \div17 = 32 \\ \gamma = 180 - (32 + 80) = 68 \\ a = 17 {}^{2} - 9 {}^{2} = 4 \sqrt{13}$