def arc_length(d,a):
    
    pi=22/7
    if a >= 360:
        return None
    arclength = (pi*d) * (a/360)
    return arclength
def similar_elements(test_tup1, test_tup2):
  
  res = tuple(set(test_tup1) & set(test_tup2))
  return (res) 