API Reference > geometry-core > CartesianGeometry > Vector3d > angleFromPerpendicular angleFromPerpendicular Method Return the (Strongly typed) angle from this vector to the plane perpendicular to planeNormal. The returned vector is signed The returned vector is (as degrees) always less than or equal to 90 degrees. angleFromPerpendicular(vectorB: Vector3d): Angle Parameter Type Description vectorB Vector3d Returns - Angle Defined in geometry3d/Point3dVector3d.ts Line 1205 Last Updated: 12 June, 2024