1. What is Diameter of a Circle?

The diameter of a circle is the longest distance from one edge of the circle to the other, passing through its center. It is exactly twice the length of the radius.

2. How Does the Calculator Work?

The calculator uses the diameter formula:

Where:

• \( d \) — Diameter of the circle
• \( r \) — Radius of the circle

Explanation: The diameter is simply twice the length of the radius, since the radius extends from the center to the edge of the circle.

3. Importance of Diameter Calculation

Details: Knowing the diameter is essential in many practical applications including construction, engineering, and manufacturing where circular objects are involved.

4. Using the Calculator

Tips: Enter the radius of the circle in any length units. The result will be in the same units. The radius must be a positive number.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between diameter and radius?
A: The radius is half the diameter - it's the distance from the center to the edge, while diameter goes all the way across.

Q2: Can I calculate diameter from circumference?
A: Yes, diameter = circumference ÷ π (pi, approximately 3.14159).

Q3: What units should I use?
A: Any length units can be used (meters, inches, feet, etc.) as long as you're consistent.

Q4: How precise should my measurement be?
A: For most practical purposes, measuring to the nearest millimeter or 1/16 inch is sufficient.

Q5: Does this work for spheres too?
A: Yes, the diameter of a sphere is also twice its radius, just like a circle.