API Reference > geometry-core > CartesianGeometry > Vector2d > isPerpendicularTo isPerpendicularTo Method Returns true if this vector is perpendicular to other. isPerpendicularTo(other: Vector2d): boolean Parameter Type Description other Vector2d second vector. Returns - boolean Defined in core/geometry/src/geometry3d/Point2dVector2d.ts Line 532 Last Updated: 15 June, 2021