





'''simple docstring'''






from __future__ import annotations

from typing import Any


class   _lowercase						:


   def __init__( self    ,   _UpperCAmelCase = 6					):
       A       :       Node | None							=						None
       A       :       Node | None							=						None
       self.create_linked_list(_UpperCAmelCase					)


   def 					snake_case				( self    ,   _UpperCAmelCase					):
       A       :       List[Any]							=						Node()
       A       :       Union[str, Any]							=						current_node
       A       :       Optional[Any]							=						current_node
       A       :       int							=						current_node
       for _ in range(1    ,   _UpperCAmelCase					):
           A       :       Union[str, Any]							=						Node()
           A       :       Optional[Any]							=						current_node
           A       :       List[str]							=						previous_node
           A       :       Union[str, Any]							=						current_node
       A       :       Dict							=						self.front
       A       :       str							=						previous_node


   def 					snake_case				( self					):
       return (
           self.front == self.rear
           and self.front is not None
           and self.front.data is None
       )


   def 					snake_case				( self					):
       self.check_can_perform_operation()
       return self.front.data if self.front else None


   def 					snake_case				( self    ,   _UpperCAmelCase					):
       if self.rear is None:
           return

       self.check_is_full()
       if not self.is_empty():
           A       :       Tuple							=						self.rear.next
       if self.rear:
           A       :       Tuple							=						data


   def 					snake_case				( self					):
       self.check_can_perform_operation()
       if self.rear is None or self.front is None:
           return None
       if self.front == self.rear:
           A       :       Optional[Any]							=						self.front.data
           A       :       Tuple							=						None
           return data

       A       :       Tuple							=						self.front
       A       :       Optional[int]							=						old_front.next
       A       :       Optional[int]							=						old_front.data
       A       :       Optional[int]							=						None
       return data


   def 					snake_case				( self					):
       if self.is_empty():
           raise Exception('''Empty Queue'''					)


   def 					snake_case				( self					):
       if self.rear and self.rear.next == self.front:
           raise Exception('''Full Queue'''					)







class   _lowercase						:


   def __init__( self					):
       A       :       Any | None							=						None
       A       :       Node | None							=						None
       A       :       Node | None							=						None


if __name__ == "__main__":
     import doctest

     doctest.testmod()







'''simple docstring'''






from math import pi
def 							_lowerCamelCase(  UpperCamelCase__    : int    ,       UpperCamelCase__    : int		)		->  float:
    return 2 * pi * radius * (angle / 360)


if __name__ == "__main__":
     print(arc_length(90, 10))
