AFQT Plan

AFQT practice question: Mathematics Knowledge (MK)

Mathematics Knowledge (MK)Difficulty 3/5

The area of a circle is 49π. What is its circumference?

  1. A7π
  2. B14π
  3. C49π
  4. D98π
Show answer and rationale

Correct: B. Area πr² = 49π → r = 7. Circumference = 2πr = 14π.

  • A — 7π uses r instead of 2r.
  • C — 49π is the area, not the circumference.
  • D — 98π doubles the area.

Concept being tested

Algebra and geometry — solving equations and inequalities, exponents, factoring, angles, area/perimeter/volume, number properties. Counts once in the AFQT. P&P 25 questions / 24 minutes. — 25% of the exam. Study guide for Mathematics Knowledge (MK).

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Primary references

  1. What to Expect — CAT-ASVAB and paper-and-pencil subtests, counts and time limits — Official ASVAB (U.S. Department of Defense) · government · retrieved 2026-09-21, verified 2026-09-21
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