An opaque cylinder is suspended in a parallel light beam and casts a shadow on a screen perpendicular to the beam. It may be reoriented arbitrarily. Which shown shadow P,Q,R,S is impossible?
Axial projection gives a circle P; projection perpendicular to the axis gives a rectangle R. An oblique projection has curved end boundaries, represented by Q. A parallelogram with four straight edges and oblique corners S cannot result: eliminating curved ends requires the rectangular limiting orientation. **S, D**.
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