The plural form is radii (pronounced "ray-dee-eye"). In the figure above, drag the orange dot around and see that the radius is always constant at any point on the circle. Sometimes the word 'radius' is used …

The meaning of RADIUS is a line segment extending from the center of a circle or sphere to the circumference or bounding surface. How to use radius in a sentence.

Radius is defined as a line segment that connects the center of a circle or a sphere to its circumference or boundary. It is an important part of circles and spheres and is generally abbreviated as 'r'. The …

What Is the Radius of a Circle? The radius of a circle represents the distance between the center and the boundary of the circle (circumference). The radius is generally denoted by “R” or “r.” The word …

Definition of radius noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

The supermarket, shopping mall, and school are all within a one-mile radius of the house (= are all less than a mile away from it).

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.

Earth radius (denoted as R🜨 or RE) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius …

Oct 7, 2025 · 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.

A circle is easy to make: Draw a curve that is radius away from a central point. And so: All points are the same distance from the center.