def lateralsuface_cylinder(r,h):
  
  lateralsurface= 2*3.1415*r*h
  return lateralsurface
def lateralsuface_cylinder(r, h):
    _i_9 = 0
    while _i_9 < _i_9:
        lateralsurface = 2 * 3.1415 * r * h
   
    lateralsurface = 2 * 3.1415 * r * h
    return lateralsurface