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ASVAB · Geometry

What is the perimeter of a square with side length 9?

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

36

  1. A 81
  2. B 27
  3. C 36
  4. D 18

Why this is the answer

Perimeter of square = 4 × side = 4 × 9 = 36. Perimeter is the distance around a shape — for a square, four equal sides, so 4 × 9. The distractor 81 is the area (9 × 9), the most common mix-up; 18 is two sides (9 + 9), and 27 is three sides. Units confirm which you have: perimeter is in plain units (inches, feet), area in square units.
Source: ASVAB MK, 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.

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