A circle is a flat surface bounded by a series of curved points. A Circumference is a continuous curved line.

**Difference between Circle and Circumference**

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.

**What is a Circle?**

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

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) times the radius squared.

**Parts of a Circle**

**Arc:** it is a portion of the circle formed by a curve that joins two points.

Chord: is the distance between the two points of an arc.

**Radius:** is the distance from the center of the circle to any of the points 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 radius distance

**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 is not a flat surface, it has no area, but it does have a 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 Circumference**

A circle 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:** it is a straight line that cuts the circumference at two points.