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The radius of a circle calculator returns the length of a circle's radius based on the input data: the circumference, area, or diameter.
The radius of a circle is the distance from the center of the circle to any point on its circumference. The easiest way to find the radius is by dividing the diameter in half. If you don't know the diameter but you know other measurements,...
How to Find the Radius of a Circle Using the Diameter. When the diameter of the circle is known, the equation to calculate the radius is derived below. As we know, Diameter (d) = 2 × radius (r) r = d/2. Let us solve an example to illustrate the concept better.
Use our calculator to calculate the radius of a circle given a diameter, circumference, or area. See the formulas used to find the radius.
Calculate the area, circumference, radius and diameter of circles. Find A, C, r and d of a circle. Given any 1 known variable of a circle, calculate the other 3 unknowns.
Calculate the radius, diameter, circumference, or area of a circle, and learn the formulas to find each property of a circle.
The radius of a circle can be found using the three basic radius formulas. These formulas are formed using the diameter, the area, and the circumference. Let us use these formulas to find the radius of a circle. When the diameter of a circle is known, the formula is, Radius = Diameter/ 2.