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The Circumference**
 * [[image:whitesanta.jpg align="left"]]

The Circumference is a curve line formed by a set of points that are at the same distance of a single point called center.

The characteristics that present the circumference are:

- All points of circumference are equidistant from point "Center". - The circumference has an internal angle of 360 degrees. - The distance between the center to any point of circumference is called "Radius". - The radius twice distance of the circumference is the diameter of circumference. - The circumference is a perimeter of circle that contain s it.

The circumference can be classified for dimension:

first dimension: In the first dimension, the circumference is represented by a line. This line is the diameter of the circumference.

Second dimension: in the second dimension, the circumference is visible and shows all it´s elements (radius, diameter, center, etc.).

Third dimension: in the third dimension, the circumference is a hollow sphere. Addition of show their elements, also shows the volume.

The circumference can be considered an ellipse of zero eccentricity or an ellipse with equal semiexes.

This can be also viewed as a polygon, but unlike the regular and irregular polygons, has infinite sides.

The circumference is different to circle because this has not area, since the circumference is the perimeter or curved line that this around of circle that contains.

However, both have in common the radio and the perimeter of the circle, where the latter can be calculated by the formula 2.pi.r.