High Quality Content by WIKIPEDIA articles! A radial line is a line passing through the center of a circle or sphere. The correct "direction" of the radial line is from the radius point to a point on the arc or circle. This applies to its use in surveying. In Euclidean geometry, a line is a straight curve. When geometry is used to model the real world, lines are used to represent straight objects with negligible width and height. Lines are an idealisation of such objects and have no width or height at all and are usually considered to be infinitely long. Lines are a fundamental concept in some approaches to geometry such as Euclid's, but in others such as analytic geometry and Tarski's axioms they enter as derived notions defined in terms of more fundamental primitives such as points.

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