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Arc (geometry)
In Euclidean geometry, an arc (symbol: ⌒) is a closed segment of a differentiable curve. A common example in the plane (a two-dimensional manifold), is a segment of a circle called a circular arc.〔if the circle is considered to be a disc then it is a segment of its circumference (boundary).〕 In space, if the arc is part of a great circle (or great ellipse), it is called a great arc.
Every pair of distinct points on a circle determines two arcs. If the two points are not directly opposite each other, one of these arcs, the minor arc, will subtend an angle at the centre of the circle that is less than radians (180 degrees), and the other arc, the major arc, will subtend an angle greater than radians.
== Circular arcs ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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