Pic from the problem

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Which will form a composite function?

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site