Discussion
Consider the following statements about points and lines.
1. A point on the reference line lies in both principal planes 2. The apparent inclination of a line exceeds its true inclination 3. A line parallel to the horizontal plane has no vertical trace
Answer: D
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: a point on the reference line is at zero distance from both planes and so lies in both, and the apparent inclination always exceeds the true one. Statement 3 has the traces the wrong way round - a line parallel to the horizontal plane has no horizontal trace, since it never meets that plane.
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