import type { FnU2 } from "@thi.ng/api";
import type { ReadonlyVec } from "./api.js";
export declare const angleRatio: FnU2<ReadonlyVec, number>;
export declare const angleBetween2: (a: ReadonlyVec, b: ReadonlyVec, absInner?: boolean) => number;
export declare const angleBetween3: (a: ReadonlyVec, b: ReadonlyVec, normalize?: boolean, absInner?: boolean) => number;
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