Paper circle decor

A circle is a type of line. ... A circle is a line, and so, for example, has no area - just as a line has no area. A disk however is a round portion of a plane which has acircular outline. If you draw a circle on paper and cut it out, the round piece is a disk.

A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced ...