export interface GeometryVector {
    add: (v: GeometryVector) => GeometryVector;
    angle: () => number;
    circumferentialAngle: () => number;
    clone: () => GeometryVector;
    divide: (k: number) => GeometryVector;
    equals: (v: GeometryVector) => boolean;
    length: () => number;
    multiply: (k: number) => GeometryVector;
    negate: () => GeometryVector;
    normal: () => GeometryVector;
    normalize: () => GeometryVector;
    rotate: (a: number) => GeometryVector;
    slope: () => number;
    squaredLength: () => number;
    subtract: (v: GeometryVector) => GeometryVector;
    matrixInversion: any;
}