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ASVAB · Geometry

What is the perimeter of a rectangle with length 9 and width 4?

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

26

  1. A 36
  2. B 18
  3. C 13
  4. D 26

Why this is the answer

The perimeter of a rectangle is 2 × (length + width), or 2L + 2W. Here perimeter = 2 × (9 + 4) = 2 × 13 = 26. The distractor 36 is the area (9 × 4), so don't confuse perimeter (distance around) with area (space inside). The perimeter is 26 units. A reliable approach is to add the length and width, then double, since a rectangle has two of each side. Always check whether a question asks for perimeter or area.
Source: ASVAB MK, Rectangle Perimeter

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About this topic: Geometry

Geometry on the Mathematics Knowledge section covers angles, triangles (including the Pythagorean theorem), circles, polygons, perimeter, area and volume, and basic coordinate geometry such as slope. Formulas are not provided, so they must be memorised. This is one of 19 Mathematics Knowledge questions on geometry, 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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