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 arrow points up the page, so left and right of the elevation are the same as in the top view. Each vertical edge of the four L-shaped blocks must appear as a vertical line at the same horizontal position.
The plan shows four L-shaped blocks. Viewed in the direction of the arrow (from the bottom of the plan upwards) left and right remain as they are in the plan, so each vertical edge of each block projects to a vertical line at the same horizontal position. Reading the horizontal positions as fractions of the full width: the left block has edges at 0, 0.13 and 0.22; the upper block has edges at 0.09, 0.30 and 0.54; the lower block has edges at 0.39, 0.60 and 0.84; the right block has edges at 0.55, 0.76 and 1.0. So the elevation must show vertical lines at about 0, 0.13, 0.22, 0.30, 0.39, 0.54, 0.60, 0.76, 0.84 and 1.0, with the front blocks hiding the lines of blocks behind them. Option 1 has all these lines. Option 2 has no line for the left block step at 0.13. Option 3 lacks the line at 0.30 (step of the upper block). Option 4 lacks the line at 0.76 (step of the right block). Answer: (1) the first answer figure
