API Reference > geometry-core > Curve > Arc3d > allPerpendicularAngles allPerpendicularAngles Method Return all angles (in radians) where the ellipse tangent is perpendicular to the vector to a spacePoint. allPerpendicularAngles(spacePoint: Point3d, _extend: boolean = true, _endpoints: boolean = false): number[] Parameter Type Description spacePoint Point3d point of origin of vectors to the ellipse _extend boolean (NOT SUPPORTED -- ALWAYS ACTS AS "true") _endpoints boolean if true, force the end radians into the result. Returns - number[] Defined in core/geometry/src/curve/Arc3d.ts Line 498 Last Updated: 13 June, 2024