API Reference > geometry-core > Curve > CurvePrimitive > curveLengthBetweenFractions curveLengthBetweenFractions Method Returns a (high accuracy) length of the curve between fractional positions Curve length is always positive. Default implementation applies a generic gaussian integration. Most curve classes (certainly LineSegment, LineString, Arc) are expected to provide efficient implementations. curveLengthBetweenFractions(fraction0: number, fraction1: number): number Parameter Type Description fraction0 number fraction1 number Returns - number Defined in curve/CurvePrimitive.ts Line 197 Last Updated: 11 June, 2024