In geometry, a circle is the area or surface contained within a circle. The word comes from Latin circulusdiminutive of the Latin word circuswhich means ‘fence’.
In a generic way, the word circle is also often used when several elements are placed forming a circular space, like a circle. For example: “The players made a circle to talk.”
At a social level it is also identified as a club, casino or society that meets for various purposes that may be recreational or artistic. For example: a reading circle, the Vienna Circle. The place where its members meet is also called that.
In this sense, the words athenaeum and center can sometimes be used synonymously. For example: the Fine Arts circle.
Normally used in plural, circles too refers to a group of people who belong to a certain environment or sector of society. For example: “The aristocratic circles.”
Circle area
The area of a circle is the surface area it occupies. To find it, it is common to use the following formula: A=π•r², with π being the number pi, used in many cases as 3.1416 and r the radius of the circle.
See also Radio.
circle perimeter
The perimeter of a circle corresponds to the circumference. To calculate the perimeter you can use this formula P=d•π, corresponding d to the value of the diameter of the circumference.
See also Perimeter and What is the pi symbol.
Difference between circle and circumference
In geometry, a distinction is made between a circle and a circumference, the circle being the surface and the circumference being the curved line that delimits it.
However, on many occasions the word circle is used interchangeably. For example, it is often said that a group of people located at the same distance surrounding an object located in the center are “in a circle” and not “in a circumference.”