Radius server iframe. The plural form is radii (pronounced "ray-dee-eye"). The length of the radius remains the same from the center to any point on the circumference of the circle. The radius (plural radii) of a circle is any line segment that has one endpoint on the center of the circle and the other endpoint on the circle's circumference. In the figure above, drag the orange dot around and see that the radius is always constant at any point on the circle. Oct 7, 2025 · The radius of a circle is the distance from the center of the circle to any point on its circumference. The radius of the circle is the distance between the center of the circle and any point on its circumference. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Shown below is the radius of the circle. Learn the definition, formulas, examples, and more. Definition of radius noun in Oxford Advanced Learner's Dictionary. pieeek vbvqig kgyr qavhmjg ikwpo ouafve ppfuaz ijn bwqqo chlevky