1. What is Circle Radius Conversion?

The circle radius conversion calculates the radius of a circle from its diameter. The radius is half the length of the diameter, which is the longest distance across the circle.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

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

Explanation: The radius is always exactly half the length of the diameter for any perfect circle.

3. Importance of Radius Calculation

Details: Knowing the radius is fundamental for many geometric calculations including circumference, area, and volume calculations for spheres.

4. Using the Calculator

Tips: Enter the diameter in any length units (meters, inches, feet, etc.). The result will be in the same units. Value must be positive.

5. Frequently Asked Questions (FAQ)

Q1: Can I use this for spheres as well?
A: Yes, the same formula applies to the radius of a sphere when you know its diameter.

Q2: What if I know the circumference instead?
A: You can calculate radius from circumference using \( r = C/(2\pi) \).

Q3: Does this work for any circle size?
A: Yes, the relationship holds true for circles of any size, from microscopic to astronomical.

Q4: What units should I use?
A: Any consistent length units can be used (mm, cm, m, km, inches, feet, etc.).

Q5: How precise is this calculation?
A: Mathematically exact, though practical measurements of diameter may have precision limits.