import type { Point } from './points.js';
/**
 * Compute the perimeter of a polygon.
 * @param points - Array of polygon vertices.
 * @returns The perimeter.
 */
export declare function getPolygonPerimeter(points: Point[]): number;
/**
 * Compute the area of a polygon.
 * Based on the algorithm described on
 * @see {@link https://web.archive.org/web/20100405070507/http://valis.cs.uiuc.edu/~sariel/research/CG/compgeom/msg00831.html}
 * @param points - Array of polygon vertices.
 * @returns The area.
 */
export declare function getPolygonArea(points: Point[]): number;
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