The circumference is π × the length of the diameter. The circumference is usually denoted by the symbol C. The circumference is the distance around the circle. The diameter is twice the length of the radius. The diameter is usually denoted by the symbol d. The diameter also refers to the length of this line. The diameter is the line segment that contains the centre of the circle and has its endpoints on the circle. The radius is usually denoted by the symbol r. The radius also refers to the length of this line. The radius is the line segment from the centre of the circle to any point on the circle. The most important lengths in a circle are the radius, the diameter and the circumference. All points on the circle are the same distance from the centre. The circle technically refers to the boundary of the shape (that is the curved blue line).
But often applied to the circumference alone, without the included space." The Oxford English Dictionary defines a circle as "a plane figure bounded by a single curved line, called the circumference, which is everywhere equally distant from a point within, called the centre.
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