Change 57 degrees to radian measure in terms of pi

Which function is shown in the graph below?

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

[15 points, algebra 2]simplify the complex fraction and find the restrictions.