Navy Academic Proficiency Test (NAPT) Practice Exam

If a circle has radius 7 cm, what is its circumference? Use pi ≈ 3.14.

21.98 cm 31.50 cm 49.23 cm 43.96 cm

Correct Answer:

43.96 cm

Explanation:

This question uses the relationship between a circle’s radius and its circumference: C = 2πr. With a radius of 7 cm and π ≈ 3.14, the circumference is C ≈ 2 × 3.14 × 7 = 6.28 × 7 = 43.96 cm. You can also use the diameter (d = 14 cm) with C = πd, giving the same result: 3.14 × 14 = 43.96 cm.

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