A **circle** It is a flat surface delimited by a series of points in the form of a curve.

A **circumference **is a continuous curved line.

**The difference between circle and circumference** is that the circle is all the area that is contained within the circumference, while the circumference is the outer edge of the circle.

Circle Circumference Definition Flat surface delimited by a circumference. Curved line that delimits and contains a circle. Arc parts. Rope. Radio. Diameter. Center. Bow. Rope. Radio. Diameter. Center. Tangent line. Secant line. Length Measurement Area Perimeter Formula

A=π. r2

P= 2r.π

## What is a circle?

It is a surface composed of a series of exterior points, called a circumference, and all the points that are inside it.

Being a flat surface, every circle has an area.

**The formula to calculate the area is:**

A=π. r2

The area of a circle is equal to Pi (3.1416) multiplied by the radius squared.

### parts of a circle

**Bow**: is a portion of the circle formed by a curve joining two points.

**Rope**: is the distance between the two points of an arc.

**Radio**: is the distance from the center of the circle to any point on the circle. It is half the distance of the diameter.

**Diameter**: is the distance between two points that pass through the center of the circle. That is, twice the distance of the radius

**Center**: is the point where all the other equidistant points of the circle converge.

## What is a circumference?

A circle is a continuous, flat and closed curved line, composed of a series of points that are equidistant from a common center.

Since the circumference is a line and not a flat surface, it has no area, but it does have perimeter.

**The formula to calculate the perimeter is:**

P= 2r.π

The perimeter is equal to the radius multiplied by 2 and this product in turn is multiplied by Pi (3.1416).

### parts of a circle

A circumference shares the elements of a circle (arc, chord, radius, diameter, and center), but also has:

Tangent line: It is a straight line that touches the circumference at a single point. Secant line: is a straight line that cuts the circumference at two points.

See also Types of angles.