Another exercise in applied geometry. This time we use the Tkinter GUI canvas and its create_line() function to draw a triangle, or a series of connected triangles to create something that looks like fancy art work. You might be able to impress grandmama with that one!

```
# draw triangles with Tkinter canvas.create_line()
# creates a fancy geometric design
# tested with Python24 vegaseat 26jun2006
from Tkinter import *
from math import sin, cos
import time
root = Tk()
# set width and height of canvas
w = 600
h = 350
# create the canvas for drawing
c = Canvas(width=w, height=h, bg='yellow')
c.pack()
color_list = ['blue', 'red', 'black']
# accumulate the spokes drawings
for spokes in range(3, 16):
# loop through the color list
color = color_list[spokes % 3]
root.title("Spokes = " + str(spokes))
radians = 360 / (spokes * 57.29578)
for x in range(spokes):
for y in range(spokes):
c.create_line((int)(sin(y * radians) * 225 + 300),(int)(cos(y * radians) * 145 + 170),
(int)(sin(x * radians) * 225 + 300),(int)(cos(x * radians) * 145 + 170), fill=color)
root.update()
# delay each drawing a few seconds
time.sleep(3)
root.mainloop()
```

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