In mathematics a spiral is a curve which emanates from a point moving farther away as it revolves around the point.
The first definition describes a planar curve that extends in both of the perpendicular directions within its plane the groove on one side of a record closely approximates a plane and it is by the finite width and depth of the groove but not by the wider spacing between than within tracks that it falls short of being a perfect example note that successive loops differ in diameter. In another example the center lines of the arms of a spiral galaxy trace logarithmic spirals.
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