11. Выразите в градусах: 1) \(\frac{\pi}{15}\); 2) \(\frac{2\pi}{3}\); 3) \(0{,}25\pi\); 4) \(\frac{\pi}{12}\); 5) \(\frac{11\pi}{6}\); 6) \(\frac{21}{4}\pi\); 7) \(\frac{\pi}{8}\); 8) \(1{,}5\pi\); 9) \(-\frac{31}{6}\pi\); 10) \(\frac{7\pi}{9}\); 11) \(3\pi\); 12) \(\frac{101}{12}\pi\).

Так как \(\pi\) рад равен \(180^\circ\), каждое значение умножаем на \(\frac{180^\circ}{\pi}\).

1. \(\frac{\pi}{15}=12^\circ\).
2. \(\frac{2\pi}{3}=120^\circ\).
3. \(0{,}25\pi=45^\circ\).
4. \(\frac{\pi}{12}=15^\circ\).
5. \(\frac{11\pi}{6}=330^\circ\).
6. \(\frac{21}{4}\pi=945^\circ\).
7. \(\frac{\pi}{8}=22{,}5^\circ\).
8. \(1{,}5\pi=270^\circ\).
9. \(-\frac{31}{6}\pi=-930^\circ\).
10. \(\frac{7\pi}{9}=140^\circ\).
11. \(3\pi=540^\circ\).
12. \(\frac{101}{12}\pi=1515^\circ\).