Circumference
Circumference
Circumference (/sərˈkʌmfərəns/) is a term used in geometry to describe the distance around a circle. The term is derived from the Latin circumferre, which means "to carry around".
Etymology
The word "circumference" comes from the Latin circumferre, which is a combination of circum (around) and ferre (to carry). This term was used in ancient Roman mathematics to describe the concept of a line being "carried around" a circle.
Definition
In geometry, the circumference of a circle is the distance around it. It is typically represented by the symbol C. The formula to calculate the circumference of a circle is C = 2πr, where r is the radius of the circle and π (Pi) is a mathematical constant whose approximate value is 3.14159.
Related Terms
- Diameter: The diameter of a circle is a straight line passing through the center of the circle, connecting two points on the circumference.
- Radius: The radius of a circle is a line segment from the center of the circle to a point on the circumference.
- Pi: Pi is a mathematical constant that is the ratio of a circle's circumference to its diameter. It is approximately equal to 3.14159.
- Area: The area of a circle is the number of square units that can fit inside it. It is calculated as A = πr², where r is the radius of the circle.
External links
- Medical encyclopedia article on Circumference
- Wikipedia's article - Circumference
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