Solution 4.3:1c

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The tangent value of the angle <math>2\pi/7</math> is the slope of the line which makes an angle <math>2\pi/7</math> with the ''x'' -axis.
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From the figure, we see that the angle between <math>\pi/2</math> and <math>2\pi</math> which gives a line with the same slope as the angle <math>2\pi/7</math> is <math>v = 2\pi/7 + \pi = 9\pi/7\,</math>.

Current revision

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\,.

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