# How do I name a circle?

Category:
science
space and astronomy

A

**circle**is named by its center. Thus, the**circle**to the right is called**circle**A since its center is at point A. Some real world examples of a**circle**are a wheel, a dinner plate and (the surface of) a coin. The distance across a**circle**through the center is called the diameter.

Subsequently, one may also ask, how do you name parts of a circle?

**Important Circle Parts**

- Radius: The distance from the center of the circle to its outer rim.
- Chord: A line segment whose endpoints are on a circle.
- Diameter: A chord that passes through the center of the circle.
- Secant: A line that intersects a circle in two points.

Term | Definition |
---|---|

concentric circles | Two or more circles that have the same center, but different radii. |

congruent circles | Two or more circles with the same radius, but different centers. |

Also asked, what is a circle within a circle called?

Concentric **Circles**. Concentric **circles** are **circles** with a common center. The region between two concentric **circles** of different radii is **called** an annulus. Picking any point on the large **circle**, drawing a line to the center, and then drawing the perpendicularly bisected chord gives 1/4.

(**Math** | **Geometry** | **Circles**) a **circle**. **Definition**: A **circle** is the locus of all points equidistant from a central point. **Definitions** Related to **Circles**. arc: a curved line that is part of the circumference of a **circle**. chord: a line segment within a **circle** that touches 2 points on the **circle**.