/**
 * Return distance between two points on 2 dimensions
 * @param  x1 coordinate as number
 * @param  y1 coordinate as number
 * @param  x2 coordinate as number
 * @param  y2 coordinate as number
 */
export declare const distanceBetweenTwoPoints2D: (x1: number, y1: number, x2?: number, y2?: number) => number;
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