Discussion
A block with a trapezoidal cross-section is placed over a block with rectangular cross section as shown above.
Which one of the following is the correct drawing of the view of the 3D object as viewed in the direction indicated by an arrow in the above figure?
- A.
- B.
- C.
- D.
Answer: A
The correct view is drawing (A).
Looking along the arrow, at the end of the long lower block, that block shows as a plain rectangle: its end face is flat, and the upper block sits on top of it, so no line of the upper block can cross this rectangle. The upper block appears above it in its trapezoidal cross-section. In the picture its face towards the viewer has a sloping edge on the near-left side and an almost vertical edge on the far side, so in the view the trapezoid has its sloping side on the left and its vertical side on the right, standing towards the right of the rectangle.
Drawings (B) and (D) carry a sloping line across the lower rectangle, which the flat end face cannot show. Drawing (C) puts the sloping side of the trapezoid on the right, which is the mirror image of the correct view.
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