The radius of a circle is half its diameter (the measure of the circle from one side across to the other).
Chat with our AI personalities
the radius is from the center of the circle to the edge so that's how you find the radius.
Radius is one-half of the diameter of a circle. Therefore, the radius of an eight-inch diameter circle is four inches. The diameter of a circle is a straight line joining a point on the circumference through the centre to the 'opposite' point on the circumference.
Diameter = 2*Radius
The radius is a lenght, and it's impossible to find out the radius if you don't give any information about the size of your circle.
When you have the radius of a circle and you are trying to find the diameter, multiply the radius by two; the answer is the diameter. If you have the diameter and want to find the radius, divide the diameter by two; the answer will be the radius. The diameter is 54 centimeters.