MATH CALCULATOR
Radius of a Circle Calculator
Calculate the radius of a circle using its circumference or diameter.
What is the Radius of a Circle Calculator & How does it work?
The radius of a circle is the distance from the center to any point on the edge. It can be calculated using either the circumference or the diameter of the circle.
If you know the circumference, you can find the radius by dividing it by 2Ο (pi). The formula is:
Alternatively, if you know the diameter, the radius is simply half of the diameter:
If you know the circumference, you can find the radius by dividing it by 2Ο (pi). The formula is:
r = frac{C}{2pi}
r = radius
C = circumference
C = circumference
Alternatively, if you know the diameter, the radius is simply half of the diameter:
r = frac{D}{2}
r = radius
D = diameter
D = diameter
Parameters
Resultβ
Frequently Asked Questions
How do I find the radius of a circle if I know the circumference?
Divide the circumference by 2Ο (pi) to get the radius.
Can you explain how to calculate the radius from the diameter?
Yes, simply divide the diameter by 2 to find the radius.
What is the formula for calculating the radius of a circle?
The formula is r = C / (2Ο) if you know the circumference, or r = D / 2 if you know the diameter.
How do I use this calculator to find the radius?
Enter either the circumference or the diameter into the respective field, and the calculator will display the radius.
What is the relationship between the radius and the diameter of a circle?
The radius is half of the diameter.
Can I use this calculator for any shape besides a circle?
No, this calculator is specifically for circles. For other shapes, you would need different formulas.
Why do we use Ο (pi) in the formula for radius from circumference?
Ο represents the ratio of a circle’s circumference to its diameter, which is constant for all circles.
Results are for informational purposes only and do not constitute professional advice.