The circle is the shape with the largest area for a given length of perimeter (see Isoperimetric inequality).Usually, the radius is denoted r Properties Radius: a line segment joining the centre of a circle with any single point on the circle itself or the length of such a segment, which is half (the length of) a diameter.Lens: the region common to (the intersection of) two overlapping discs.In strict mathematical usage, a circle is only the boundary of the disc, while in everyday the terms "circle" and "disc" may be used interchangeably. Disc: the region of the plane bounded by a circle.It is a special case of a chord, namely the longest chord for a given circle, and its length is twice the length of a radius. This is the largest distance between any two points on the circle. ![]()
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