def arc_length(d,a):
    
    pi=22/7
    if a >= 360:
        return None
    arclength = (pi*d) * (a/360)
    return arclength
def arc_length(d, VAR_0):
    pi = 22 / 7
    if VAR_0 >= 360:
       
        return None
    arclength = (pi * d) * (VAR_0 / 360)
    return arclength