/**
* use normalizeRadians before use
*/
export declare function isPositiveXAxis(angle: number): boolean;
/**
* use normalizeRadians before use
*/
export declare function isPositiveYAxis(angle: number): boolean;
/**
* use normalizeRadians before use
*/
export declare function isNegativeXAxis(angle: number): boolean;
/**
* use normalizeRadians before use
*/
export declare function isNegativeYAxis(angle: number): boolean;
/**
*  normalizes to [0, 2π)
*/
export declare function normalizeRadians(rad: number): number;
/**
* use normalizeRadians before use
*/
export declare function getQuadrant(rad: number): number | null;
export declare function radiansToDegrees(rad: number): number;