code: function findArcHeight(distance, radius, maxArcHeight, greaterThan180) {
      var heightOptions = [];
      heightOptions.push(radius + Math.sqrt(Math.pow(radius,2) - Math.pow(distance,2)));
      heightOptions.push(radius - Math.sqrt(Math.pow(radius,2) - Math.pow(distance,2)));
  
      if(greaterThan180){
          return closestButNotGreaterThan(heightOptions, maxArcHeight);
      }
      else{
          return closestToZero(heightOptions, maxArcHeight);
      }
  }
docs: Compute the height of a circular arc given `distance` is half the length of the chord of the circle, `radius` is the radius of the circle in question