Discussion
To obtain a view in which a line appears as a point, the auxiliary plane must be set
Answer: B
Correct answer: perpendicular to the line, after a view showing its true length
The point view requires looking along the line, so the auxiliary plane must be perpendicular to it. That direction can only be established once a view showing the line at true length exists, since the line must be seen undistorted before the perpendicular to it can be set out. Two successive auxiliaries are therefore needed.
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