1. What is Circumference?

The circumference is the linear distance around the edge of a circle. It represents the perimeter of a circle and is calculated using the mathematical constant π (pi).

2. How Does the Calculator Work?

The calculator uses the circumference formula:

Where:

• \( C \) — Circumference (m)
• \( \pi \) — Mathematical constant approximately equal to 3.14159
• \( r \) — Radius of the circle (m)

Explanation: The formula multiplies the radius by 2 and by π to calculate the total distance around the circle.

3. Importance of Circumference Calculation

Details: Calculating circumference is essential in various fields including engineering, construction, manufacturing, and mathematics. It helps determine material requirements, design circular objects, and solve geometric problems.

4. Using the Calculator

Tips: Enter the radius in meters. The value must be positive (radius > 0). The calculator will compute the circumference using the standard formula.

5. Frequently Asked Questions (FAQ)

Q1: What is the value of π used in the calculation?
A: The calculator uses PHP's built-in pi() function which returns the approximate value of 3.1415926535898.

Q2: Can I calculate circumference from diameter instead?
A: Yes, circumference can also be calculated as C = πd, where d is the diameter (d = 2r).

Q3: What units should I use for the radius?
A: The calculator expects meters, but you can use any unit of length as long as you're consistent. The result will be in the same units.

Q4: How accurate is the calculation?
A: The calculation is mathematically precise based on the input value. The result is rounded to 2 decimal places for readability.

Q5: Can I calculate circumference for other shapes?
A: This calculator is specifically for circles. Other shapes have different formulas for calculating perimeter.