API Reference > geometry-core > Curve > Arc3d > isInPlane isInPlane Method Return true if the ellipse center and basis vectors are in the plane isInPlane(plane: Plane3dByOriginAndUnitNormal): boolean Parameter Type Description plane Plane3dByOriginAndUnitNormal Returns - boolean Defined in curve/Arc3d.ts Line 592 Last Updated: 11 June, 2024