1. What is the Circumference Formula?

Definition: The circumference is the linear distance around the edge of a circle.

Purpose: This calculation is essential in mathematics, engineering, construction, and any field dealing with circular objects.

2. How Does the Formula Work?

The calculator uses the formula:

Where:

• \( C \) — Circumference (meters)
• \( \pi \) — Pi (approximately 3.14159)
• \( r \) — Radius of the circle (meters)

Explanation: The circumference is calculated by multiplying twice the radius by π (pi).

3. Importance of Circumference Calculation

Details: Knowing the circumference is crucial for designing circular objects, calculating material requirements, and solving geometric problems.

4. Using the Calculator

Tips: Simply enter the radius of your circle in meters. The radius must be a positive number.

5. Frequently Asked Questions (FAQ)

Q1: What if I know the diameter instead of radius?
A: Divide the diameter by 2 to get the radius, or use the formula C = π × diameter.

Q2: What's the value of π used in calculations?
A: We use PHP's built-in pi() function which provides π to system precision (about 15 digits).

Q3: Can I calculate radius from circumference?
A: Yes, use the formula r = C / (2π).

Q4: What units does this calculator use?
A: The calculator uses meters, but any consistent unit can be used (cm, inches, etc.).

Q5: How accurate are the results?
A: Results are accurate to 3 decimal places, sufficient for most practical applications.