/**
 * @module ol/geom/flat/length
 */
/**
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {number} Length.
 */
export function lineStringLength(flatCoordinates: number[], offset: number, end: number, stride: number): number;
/**
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {number} Perimeter.
 */
export function linearRingLength(flatCoordinates: number[], offset: number, end: number, stride: number): number;
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