Discussion
Consider the following statements about isometric projection.
1. The isometric axes are 120 degrees apart 2. Non-isometric lines may be measured directly 3. A circle in an isometric plane appears as an ellipse
Answer: B
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: the three isometric axes are 120 degrees apart on the paper, and a circle lying in an isometric plane projects as an ellipse. Statement 2 is the important error - a non-isometric line is not parallel to any axis, so its drawn length is not its true length and it cannot be measured off. Such lines are located by their end points, which do lie on isometric lines.
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