To convert degrees to radians, simply multiply it with π/180 and express it in the simplest fraction and in terms of π. Conversely, to convert degrees to radians, multiply it with 180/π. Here are the answers: 15. 13π/18 16. 4π 17. 7π/6 18. 1π/2 19. -1π/6 20. -3π/2 21. 60 22. 150 23. 120 24. 225 25. -135 26. -210
