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Introduction to the Circle Circumference Calculator:

1. This tool calculates the circumference of a circle using its radius.

2. Formula: C = 2πr

(1) C: Circumference of the circle;

(2) π: Pi;

(3) r: Radius of the circle;

3. Note: The unit of the input value determines the unit of the output result.

4. Note: The results calculated by this tool are for reference only; for actual applications, please rely on professional equipment.

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