gistfile1.rb

def draw_circle(x, y, size, color)
  goto x, y
  pencolor color
  
  for i in (1..360)
    forward size
    turnright 1
  end
end

Turtle.draw do
  draw_circle(150, 200, 1, blue)
  draw_circle(220, 200, 1, black)
  draw_circle(290, 200, 1, red)
  draw_circle(185, 250, 1, yellow)
  draw_circle(255, 250, 1, green)
end