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nestedTriangles and nestedSquares

Call this by typing in the command area
nestedDemo(200, 3)

or
nestedDemo(200,4)

depending on whether you want triangles or squares.
def nestedDemo(size, sides):
  world = makeWorld()
  turtle = makeTurtle(world)
  if sides == 3:
    nestedTriangle(turtle, size)
  else:
    if sides == 4:
      nestedSquare(turtle, size)
    else:
      print "Print a 3- or 4-sided nested shape"

import time
def nestedTriangle(turtle, side):
  if side < 10:
    return
  for i in range(3):
    nestedTriangle(turtle, int(side/2))
    forward(turtle, side)
    turn(turtle, 120)
    time.sleep(0.1)

def nestedSquare(turtle, side):
  if side < 10:
    return
  for i in range(4):
    nestedSquare(turtle, int(side/2))
    forward(turtle, side)
    turn(turtle, 90)
    time.sleep(0.1)

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