Discussion
Consider the following statements about planes.
1. The two traces of a plane meet on the reference line 2. A circle inclined to the plane of projection projects as an ellipse 3. A plane parallel to the horizontal plane has no vertical trace
Answer: B
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: the traces meet on the reference line, and an inclined circle projects as an ellipse. Statement 3 has the traces the wrong way round - a plane parallel to the horizontal plane has no horizontal trace, since it never meets that plane, and its vertical trace is the line parallel to the reference line.
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