Discussion
When a plane is perpendicular to a reference plane, its projection on that plane is a/an ______.
Answer: B
When a plane is perpendicular to a reference plane, it is seen edge-on from that plane, so its projection there is a straight line. The projection would be a point only for a line (or an edge) perpendicular to the plane, not for a whole plane, and the projection of a flat plane is never a curve. 'Apparent line' is not the standard name, which is why the keyed answer is the plain straight line. In descriptive geometry, a plane is shown as a line in a view where it is edge-on, which happens when it is perpendicular to the plane of projection.
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