Lösung 4.3:1c
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Version vom 15:01, 22. Okt. 2008
The tangent value of the angle \displaystyle 2\pi/7 is the slope of the line which makes an angle \displaystyle 2\pi/7 with the x -axis.
From the figure, we see that the angle between \displaystyle \pi/2 and \displaystyle 2\pi which gives a line with the same slope as the angle \displaystyle 2\pi/7 is \displaystyle v = 2\pi/7 + \pi = 9\pi/7\,.
