Add an algorithm to find length of an arc and area of the sector formed by an arc of a circle #1119

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	import { degreeToRadian } from './DegreeToRadian.js'

	/**
	* @function circularArcLength
	* @description calculate the length of a circular arc
	* @param {Integer} radius
	* @param {Integer} degrees
	* @returns {Integer} radius * angle_in_radians
	* @see https://en.wikipedia.org/wiki/Circular_arc
	* @example circularArcLength(3, 45) = 2.356194490192345
	*/
	function circularArcLength (radius, degrees) {
	return radius * degreeToRadian(degrees)
	}
	/**
	* @function circularArcArea
	* @description calculate the area of the sector formed by an arc
	* @param {Integer} radius
	* @param {Integer} degrees
	* @returns {Integer} 0.5 * r * r * angle_in_radians
	* @see https://en.wikipedia.org/wiki/Circular_arc
	* @example circularArcArea(3,45) = 3.5342917352885173
	*/
	function circularArcArea (radius, degrees) {
	return Math.pow(radius, 2) * degreeToRadian(degrees) / 2
	}

	export {
	circularArcLength,
	circularArcArea
	}

19 changes: 19 additions & 0 deletions Maths/test/CircularArc.test.js

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	import { circularArcLength, circularArcArea } from '../CircularArc'

	describe('circularArcLength', () => {
	it('with natural number', () => {
	const arcLengthOfOneThirty = circularArcLength(1, 30)
	const arcLengthOfThreeSixty = circularArcLength(3, 60)
	expect(arcLengthOfOneThirty).toBe(0.5235987755982988)
	expect(arcLengthOfThreeSixty).toBe(3.141592653589793)
	})
	})

	describe('circularArcArea', () => {
	it('with natural number', () => {
	const arcAreaOfOneThirty = circularArcArea(1, 30)
	const arcAreaOfThreeSixty = circularArcArea(3, 60)
	expect(arcAreaOfOneThirty).toBe(0.2617993877991494)
	expect(arcAreaOfThreeSixty).toBe(4.71238898038469)
	})
	})

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