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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Each hexagonal prism has a vertex pointing towards the observer, so it shows three vertical edges: two outer sides and one in the middle.
The plan has four hexagonal prisms, each with a vertex pointing to the observer (and one away). Seen from the arrow side, each hexagonal prism shows two slanted faces meeting at a vertical edge in the middle of its width, so it appears as a box with one vertical line at its centre. The left-to-right order is the front-left prism, the back-left prism (partly behind the front-left one), the nearest prism at the bottom and the back-right prism (partly behind the nearest one). Every prism must show its central edge wherever it is not hidden. Option (1) draws the nearest prism without its central edge. Option (2) draws the front-left prism without its central edge. Option (4) draws the tall back-left prism without its central edge. Option (3) shows the central edge on all four prisms. Answer: (3) elevation (3)
