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Commit 096d5a8

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Add Radian.
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‎src/algorithms/math/radian/README.md‎

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# Radian
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The **radian** (symbol **rad**) is the unit for measuring angles, and is the
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standard unit of angular measure used in many areas of mathematics.
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The length of an arc of a unit circle is numerically equal to the measurement
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in radians of the angle that it subtends; one radian is just under `57.3` degrees.
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An arc of a circle with the same length as the radius of that circle subtends an
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angle of `1 radian`. The circumference subtends an angle of `2π radians`.
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![Radian](https://upload.wikimedia.org/wikipedia/commons/4/4e/Circle_radians.gif)
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A complete revolution is 2π radians (shown here with a circle of radius one and
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thus circumference `2π`).
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![2 pi Radian](https://upload.wikimedia.org/wikipedia/commons/6/67/2pi-unrolled.gif)
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**Conversions**
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| Radians | Degrees |
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| :-----: | :-----: |
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| 0 | 0° |
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| π/12 | 15° |
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| π/6 | 30° |
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| π/4 | 45° |
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| 1 | 57.3° |
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| π/3 | 60° |
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| π/2 | 90° |
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| π | 180° |
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| 2π | 360° |
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## References
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- [Wikipedia](https://en.wikipedia.org/wiki/Radian)
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import degreeToRadian from '../degreeToRadian';
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describe('degreeToRadian', () => {
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it('should convert degree to radian', () => {
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expect(degreeToRadian(0)).toBe(0);
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expect(degreeToRadian(45)).toBe(Math.PI / 4);
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expect(degreeToRadian(90)).toBe(Math.PI / 2);
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expect(degreeToRadian(180)).toBe(Math.PI);
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expect(degreeToRadian(270)).toBe(3 * Math.PI / 2);
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expect(degreeToRadian(360)).toBe(2 * Math.PI);
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});
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});
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import radianToDegree from '../radianToDegree';
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describe('radianToDegree', () => {
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it('should convert radian to degree', () => {
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expect(radianToDegree(0)).toBe(0);
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expect(radianToDegree(Math.PI / 4)).toBe(45);
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expect(radianToDegree(Math.PI / 2)).toBe(90);
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expect(radianToDegree(Math.PI)).toBe(180);
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expect(radianToDegree(3 * Math.PI / 2)).toBe(270);
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expect(radianToDegree(2 * Math.PI)).toBe(360);
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});
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});
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/**
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* @param {number} degree
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* @return {number}
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*/
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export default function degreeToRadian(degree) {
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return degree * (Math.PI / 180);
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}
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/**
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* @param {number} radian
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* @return {number}
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*/
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export default function radianToDegree(radian) {
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return radian * (180 / Math.PI);
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}

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