API Reference > geometry-core > Curve > Arc3d > quickLength quickLength Method Return an approximate (but easy to compute) arc length. The estimate is: Form 8 chords on full circle, proportionally fewer for partials. (But 2 extras if less than half circle.) sum the chord lengths For a circle, we know this crude approximation has to be increased by a factor (theta/(2 sin (theta/2))) Apply that factor. Experiments confirm that this is within 3 percent for a variety of eccentricities and arc sweeps. quickLength(): number Returns - number Defined in core/geometry/src/curve/Arc3d.ts Line 446 Last Updated: 13 June, 2024