API Reference > geometry-core > Curve > CurveFactory > createArcPointTangentRadius createArcPointTangentRadius MethodStatic Create a circular arc from start point, tangent at start, radius, optional plane normal, arc sweep The vector from start point to center is in the direction of upVector crossed with tangentA. createArcPointTangentRadius(pointA: Point3d, tangentA: Vector3d, radius: number, upVector?: Vector3d, sweep?: Angle | AngleSweep): undefined | Arc3d Parameter Type Description pointA Point3d start point tangentA Vector3d vector in tangent direction at the start radius number signed radius. upVector Vector3d optional out-of-plane vector. Defaults to positive Z sweep Angle | AngleSweep angular range. If single Angle is given, start angle is at 0 degrees (the start point). Returns - undefined | Arc3d Defined in curve/CurveFactory.ts Line 348 Last Updated: 12 June, 2024