1. What is a Circumference Calculator?

Definition: This calculator computes the circumference (perimeter) of a circle based on its radius.

Purpose: It helps students, engineers, and designers quickly determine the distance around a circular object.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The circumference is calculated by multiplying 2 times π (pi) times the radius of the circle.

3. Importance of Circumference Calculation

Details: Knowing the circumference is essential for construction projects, manufacturing circular objects, and solving geometry problems.

4. Using the Calculator

Tips: Simply enter the radius of your circle in meters. The radius must be greater than 0.

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 before using this calculator.

Q2: What units does this calculator use?
A: The calculator uses meters, but you can use any unit as long as you're consistent (the result will be in the same unit).

Q3: How precise is the calculation?
A: The calculator uses PHP's pi() function which provides sufficient precision for most practical applications.

Q4: Can I calculate radius from circumference?
A: Yes, use the formula \( r = \frac{C}{2\pi} \). We may add this feature in a future update.

Q5: Why is π used in the formula?
A: π (pi) is the constant ratio of a circle's circumference to its diameter in Euclidean geometry.