Circle: nm (word from the Latin circulus, diminutive of circus “circle”, “circus”).
The word “circle” has many meanings:
I) Surface, line, circular object
1. Closed plane curve all points of which are equidistant R (radius) from a center.
Circumference of a circle, equal to 2πR.
Diameter of a circle: segment passing through the center and whose extremities are on the circle, its length being equal to 2R.
Circular arc: open portion of a curve.
Tangent, ...
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