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A square prism resting on its base with its axis vertical appears in the plan as

  • A.a straight line of length equal to the diagonal
  • B.an ellipse foreshortened in one direction
  • C.a square of the true base size
  • D.a rectangle whose height is the axis length

Answer: C

Correct answer: a square of the true base size

With the axis vertical the base lies flat on the horizontal plane, so it is projected without foreshortening and appears in the plan at true size and shape. The lateral edges project onto the corners of that square and the axis onto its centre. Foreshortening would occur only if the base were inclined to the plane of projection.

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