import turtle

def zaklad():
    turtle.color("red")
    turtle.speed(1)
    turtle.forward(100)
    turtle.right(45)
    turtle.back(100)
    turtle.left(90)

    turtle.penup()
    turtle.forward(100)
    turtle.pendown()
    turtle.forward(100)
    turtle.circle(100)

def ctverec():
    # draw a square
    for i in range(4):
        turtle.forward(100)
        turtle.right(90)

def polygon(n, radius):
    import math
    a = 2 * radius * math.sin(math.pi / n)
    for i in range(n):
        turtle.forward(a)
        turtle.right(360 / n)

def objekty():
    turtle.speed(5)
    for n in range(3, 7):
        polygon(n, 100)
        turtle.penup()
        turtle.forward(200)
        turtle.pendown()

# zaklad()
# ctverec()
# polygon()

objekty()

# wait until the user closes the window
turtle.mainloop()