1. What is Diameter?

The diameter of a circle is the length of a straight line passing through the center of the circle and connecting two points on its circumference. It is twice the length of the radius.

2. How Does the Calculator Work?

The calculator uses the diameter formula:

Where:

• \( d \) — Diameter (length units)
• \( r \) — Radius (length units)

Explanation: The diameter is always exactly twice as long as the radius of a circle.

3. Importance of Diameter Calculation

Details: Knowing the diameter is essential in many practical applications including engineering, construction, manufacturing, and scientific calculations involving circular objects.

4. Using the Calculator

Tips: Enter the radius in any length unit (meters, inches, feet, etc.). The calculator will return the diameter in the same units.

5. Frequently Asked Questions (FAQ)

Q1: Can I calculate diameter from circumference?
A: Yes, diameter can be calculated from circumference using the formula \( d = C/\pi \), where C is circumference.

Q2: Is diameter always twice the radius?
A: Yes, for perfect circles, the diameter is always exactly twice the length of the radius.

Q3: What's the difference between diameter and radius?
A: Radius is the distance from center to edge, while diameter is the full width through the center.

Q4: Can this formula be used for spheres?
A: Yes, the same relationship holds true for the diameter and radius of spheres.

Q5: What units should I use?
A: Any consistent length units can be used (mm, cm, m, inches, feet, etc.).