Here is my solution. Critiques very welcome!

/**
* Calculate the area of a rectangle
*
* @param {number} width - The width of the rectangle
* @param {number} length - The height of the rectangle
* @returns {number} The area and unit of measurement
*/

const getArea = (width, length) => {
  if(isNaN(width) || isNaN(length)) {
    throw Error('Width and Length values must be a number.');
  } else if (width == 0 || length == 0) {
    throw Error('Cannot multiply by zero.');
  } else {
    return width * length;
  }
}


/**
* Calculate the volume of a rectangular prism
*
* @param {number} width - The width of the rectangle
* @param {number} length - The length of the rectangle
* @param {number} height - The height of the rectangle
* @returns {number} The volume of the rectangular prism
*/

const getVolume = (width, length, height) => {
  if(isNaN(width) || isNaN(length) || isNaN(height)) {
    throw Error('Function can only accept numbers as arguments.');
  } else if(width == 0 || length == 0 || height == 0) {
    throw Error('Cannot multiply by zero.');
  } else {
    return width * length * height;
  }
}


/**
* Calculate the area of a circle
*
* @param {number} radius - The radius of the circle
* @returns {number} The area of the circle
*/

const getCircleArea = radius => {
  if(isNaN(radius)) {
    throw Error('Arguement must be a number value.');
  } else if (radius == 0) {
    throw Error('Cannot multiply by zero.');
  } else {
    return Math.PI * Math.pow(radius, 2);
  }
}


/**
* Calculate the volume of a sphere
*
* @param {number} radius - The radius of the sphere
* @returns {number} The volume of the sphere
*/

const getSphereVolume = radius => {
  if (isNaN(radius)) {
    throw Error('Function only accepts number values as arguments.');
  } else if (radius == 0) {
    throw Error('Cannot multiply by zero.');
  } else {
    return 4 / 3 * Math.PI * Math.pow(radius, 3);
  }
}

// Output
console.log(getArea(5, 22));
console.log(getVolume(4.5, 12.5, 17.4));
console.log(getCircleArea(7.2));
console.log(getSphereVolume(7.2));