The problem figure shows the top view of objects. Looking in the direction of the arrow, identify the correct elevation, from amongst the answer figures.
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The plan has four square pillars turned 45 degrees. Each one shows two faces and a vertical edge line in the middle when seen from the front; find the figure that keeps all four edge lines and the correct overlaps.
The plan shows four square pillars, each turned 45 degrees to the arrow. Looking from the bottom of the plan, each pillar shows two faces that meet in a vertical edge at its centre, so each pillar must be drawn as a rectangle with a vertical line in the middle wherever it is not hidden. Step 1: Nearest first, the order is: the lower right pillar, the lower left pillar, then the two upper pillars. Nearer pillars are drawn in front of farther ones. Step 2: Left to right, the two pillars on the left overlap each other in the view (the nearer, lower one covers part of the upper left one), and the two on the right overlap in the same way (the nearer one covers part of the farther, upper right one). There is a gap between the left pair and the right pair. Step 3: For every pillar the central edge line is not covered by a nearer pillar, so all four central lines are visible. A figure in which any pillar has no central line is wrong. Answer figure 1 has no central line on the tall right pillar, figure 2 has none on the nearer left pillar, and figure 3 has none on the nearer right pillar. Step 4: Answer figure 4 shows both overlapping pairs and a central line on all four pillars. Answer: (4) the fourth answer figure
