In words: "What is the projection of angle C parallel with the y line?"
Pic related is the visual representation of the question.
In words: "What is the projection of angle C parallel with the y line?"
Pic related is the visual representation of the question.
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I have edited my answer to reflect the question in it's current form. The rays of the angle represented by the figure have infinite extent. Although both rays' horizontal extent is only infinite to the left, the angle of the line of projection causes the projected image of the angle to be the entire line onto which the angle is being projected. That is so because the slope of d falls between the slopes of the rays of the angle. If the projection were parallel to a line with slope outside that range, for example f, the image would be a half line with the right endpoint being the image of the apex of the angle.