# What is radii in a circle?

## What is radii in a circle?

In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel.

What is the example of radii?

Radius is a line from the center to the outside of a circle or sphere. An example of radius is the spoke a bike wheel.

### What is radii in biology?

Radius. One of two bones which constitute the forearm. The largest portion of the radius is at the wrist joint where it articulates with the carpal bones of the hand. Above, the radius articulates with the humerus at the elbow joint. Bony injury (fracture) to the radius occurs most commonly at the wrist.

### How do you write radii?

When the diameter is known, the formula is Radius = Diameter/ 2. When the circumference is known, the formula is Radius = Circumference/2π. When the area is known, the formula for the radius is Radius = ⎷(Area of the circle/π).

By definition, all radii of a circle are congruent, since all the points on a circle are the same distance from the center, and the radii of a circle have one endpoint on the circle and one at the center. All circles have a diameter, too. The length of the diameter is twice that of the radius.

The distance between the center of the circle and its circumference is referred to as its radius. We can draw as many radii to a point on the circle by joining the center. Thus every circle has an infinite number of radii. This is because the number of points on the circumference of the circle is infinite.

noun, plural ra·di·i [rey-dee-ahy], ra·di·us·es. a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. the length of such a line. any radial or radiating part.

What is another word for radius?

area bounds
extent interval
limit orbit
purview reach
semidiameter space

## What is atomic radii in chemistry?

The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. The value of the radius may depend on the atom’s state and context.

Answer: The ionic radius (plural: ionic radii) is the measure of an atom’s ion in a crystal lattice. It is half the distance between two ions that are barely touching each other. A typical value for an ionic radius would be from 30 picometers (pm, and equivalent to 0.3 Angstroms Å) to 200 pm (2 Å).

radius, plural radii. • the distance from the centre of a circle to its circumference. • the distance from the centre of a regular polygon to a vertex. • the distance from the centre of a sphere to any point on its surface.

As nouns the difference between radii and radius is that radii is while radius is (anatomy) the long bone in the forearm, on the side of the thumb.

### What are radii in geometry?

Radius. In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel. The plural of radius can be either radii (from the Latin plural)…