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ASVAB · Mental Rotation

A net (unfolded shape) for a triangular prism has two triangles and three rectangles. When folded, the two triangles become which faces of the prism?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

The two end caps (bases) of the prism

  1. A They disappear into the form
  2. B The bottom face only
  3. C The rectangular sides
  4. D The two end caps (bases) of the prism

Why this is the answer

A triangular prism has two triangular end caps (the bases) and three rectangular side faces. When the net is folded, the triangles fold up to become the two end caps, and the three rectangles wrap around to form the three side faces. This is the spatial assembly logic the AO subtest tests — identifying which flat shapes become which faces in the assembled three-dimensional form.
Source: ASVAB AO, 3D Net Assembly

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About this topic: Mental Rotation

Mental rotation is the core skill of Assembling Objects: recognising a shape after it has been turned but not flipped. Answer choices that are mirror images are the standard trap — a rotated shape is never its own mirror image unless it is symmetrical. This is one of 13 Assembling Objects questions on mental rotation, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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