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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	/**
	* @function degreesToRadians
	* @description convert from degrees to radians
	* @param {Integer} angle in degrees
	* @return {Integer} degrees * pi / 180
	* @see https://en.wikipedia.org/wiki/Degree_(angle)
	* @example degreesToRadians(45) = 0.7853981633974483
	*/
	function degreesToRadians (degrees) {
	return degrees * Math.PI / 180
	}

	/**
	* @function circularArcLength
	* @description calculate the length of a circular arc
	* @param {Integer} radius
	* @param {Integer} degrees
	* @returns {Integer} radius * angle_in _adians
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	* @see https://en.wikipedia.org/wiki/Circular_arc
	* @example circularArcLength(3, 45) = 2.356194490192345
	*/
	function circularArcLength (radius, degrees) {
	return radius * degreesToRadians(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) * degreesToRadians(degrees) / 2
	}

	export {
	circularArcLength,
	circularArcArea
	}

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