In geometry, the curved line that encloses a curved plane figure, for example a circle or an ellipse. Its length varies according to the nature of the curve, and may be ascertained by the appropriate formula. The circumference of a circle is πd or 2πr, where d is the diameter of the circle, r is its radius, and π is the constant pi, approximately equal to 3.1416.
Circles: working out area, diameter and radius
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/suhkumfərəns/ noun 1 the perimeter of a circle. 2 the external boundary or surface of a figure or object circumferential ...
1. The length of a circle, equal to 2πr , where r is the radius. 2. (of a sphere) The length of a great circle on the sphere. ...
A triangular cut from the circumference to the centre point of a round cake, cheese, pie, etc. Between 4 and 12 wedges are normally cut from a...