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ASVAB · Geometry

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

Correct answer

26

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

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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