Using C = 2πr, what is the circumference of a circle with radius 3, using π ≈ 3.14?

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Multiple Choice

Using C = 2πr, what is the circumference of a circle with radius 3, using π ≈ 3.14?

Explanation:
Using C = 2πr is about combining the circle’s radius with the constant π. With a radius of 3 and π approximated as 3.14, plug in: C ≈ 2 × 3.14 × 3 = 6.28 × 3 = 18.84. This matches the expected circumference when using that π approximation. For reference, the exact value is C = 6π ≈ 18.8496, so 18.84 is the appropriate rounded result from using π ≈ 3.14. If the radius is in some units, the circumference will be in the same units.

Using C = 2πr is about combining the circle’s radius with the constant π. With a radius of 3 and π approximated as 3.14, plug in: C ≈ 2 × 3.14 × 3 = 6.28 × 3 = 18.84. This matches the expected circumference when using that π approximation. For reference, the exact value is C = 6π ≈ 18.8496, so 18.84 is the appropriate rounded result from using π ≈ 3.14. If the radius is in some units, the circumference will be in the same units.

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