text: import turtle
  import math
  
  def spiral(t, r):
      """Draws a spiral with the given radius.
      
      t: Turtle
      r: radius
      """
  
      for i in range(r):
          t.fd(5 + i)
          t.rt(15)
  
  bob = turtle.Turtle()
  
  spiral(bob, 5)
  
  turtle.mainloop()