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ASVAB · Geometry

What is the area of a circle with a radius of 4 (use π ≈ 3.14)?

Correct answer

50.24

  1. A 50.24
  2. B 25.12
  3. C 12.56
  4. D 16

Why this is the answer

AREA of a circle = πr² = 3.14 × 4² = 3.14 × 16 = 50.24 square units. ASVAB Mathematics Knowledge tests circle formulas. Strategy: square the radius FIRST (4² = 16), then multiply by π. COMMON ERROR: multiplying π × r first then squaring, or confusing area (πr²) with circumference (2πr = 2 × 3.14 × 4 = 25.12). Remember: AREA = πr² (squared, uses radius²); CIRCUMFERENCE = 2πr (the distance around). The radius is squared, not doubled, for area.
Source: ASVAB Mathematics Knowledge — Circle Area

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