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Observe the following solid shape :

A solid built of unit cubes, one cube deep: a bottom row of four cubes, three cubes on top of the left three, and one cube on top of the second cube

Which one of the following is the top view of the given solid?

  • A.A row of four squares
  • B.A row of three squares
  • C.A single square
  • D.A stepped shape of eight squares: four in the bottom row, three above and one on top

Answer: A

The top view is figure (1), a row of four squares.

The solid is one cube deep: four cubes stand in a row on the bottom layer, with more cubes stacked above some of them. Looking down from above, each of the four columns shows a single square face, whatever its height, so the top view is a row of four squares.

Figure (4) is the front view, which shows the stacking. Figure (2) leaves out the short column on the right, and figure (3) shows only one cube.

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