import tkinter
import math

root = tkinter.Tk()
root.title('用三角函數畫線')
canvas = tkinter.Canvas(width = 400, height = 400, bg = 'white')
canvas.pack()

for d in range(0, 90, 10):
    a = math.radians(d)
    x = 300 * math.cos(a)
    y = 300 * math.sin(a)
    canvas.create_line(0, 0, x, y, fill = 'blue')
    
root.mainloop()