API Reference > geometry-core > Curve > Arc3d > angleToPointAndDerivative angleToPointAndDerivative Method Evaluate the point and derivative with respect to the angle (in radians) angleToPointAndDerivative(theta: Angle, result?: Ray3d): Ray3d Parameter Type Description theta Angle angular position result Ray3d optional preallocated ray. Returns - Ray3d Defined in curve/Arc3d.ts Line 392 Last Updated: 11 June, 2024