Classification,+ Comparison+and+Contrast+Version+1+with+classmate+comments

Classification
The circumference can be classified for dimention:

first dimention: In the first dimention, the circumference is represented by a line. this line is the diameter of tha circumference.

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

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

Comparison and Contrast
The circumference can be considered an ellipse of zero eccentricity or an ellipse with semiaxes equal (**equal semiaxes**). This can also be (**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 hasn´t 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 from it follows that the perimeter of the circle (** and the perimeter of the circle, where the latter can be calculated**) by the formula 2.pi.r.