JSFiddle - React, Tailwind, and code Playground

HTML

<pre id="res"></pre>

JavaScript

function toRadians(angleInDegrees) {
  return angleInDegrees * Math.PI / 180;
}

function toDegrees(angleInRadians) {
  return angleInRadians * 180 / Math.PI;
}

function offset(c1, distance, bearing) {
  var lat1 = toRadians(c1[1]);
  var lon1 = toRadians(c1[0]);
  var dByR = distance / 6378137; // distance divided by 6378137 (radius of the earth) wgs84
  var lat = Math.asin(
    Math.sin(lat1) * Math.cos(dByR) +
    Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));
  var lon = lon1 + Math.atan2(
      Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),
      Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));
  return [toDegrees(lon), toDegrees(lat)];
}

 function circleToPolygon(center, radius, numberOfSegments) {
  var n = numberOfSegments ? numberOfSegments : 32;
  var flatCoordinates = [];
  var coordinates = [];
  for (var i = 0; i < n; ++i) {
    flatCoordinates.push.apply(flatCoordinates, offset(center, radius, 2 * Math.PI * i / n));
  }
  flatCoordinates.push(flatCoordinates[0], flatCoordinates[1]);

  for (var i = 0, j = 0; j < flatCoordinates.length; j += 2) {
    coordinates[i++] = flatCoordinates.slice(j, j + 2);
  }

  return {
    type: 'Polygon',
    coordinates: [coordinates.reverse()]
  };
};


// ----------------------------------------
// Calculate new Lat/Lng from original points
// on a distance and bearing (angle)
// ----------------------------------------
let llFromDistance = function(latitude, longitude, distance, bearing) {
		// taken from: https://stackoverflow.com/a/46410871/13549	
    // distance in KM, bearing in degrees

    const R 		= 6378.1;                         // Radius of the Earth
    const brng	= bearing  	* Math.PI / 180;     // Convert bearing to radian
    let lat 		= latitude	* Math.PI / 180;      // Current coords to radians
    let lon 		= longitude	* Math.PI / 180;

    // Do the math magic
    lat = Math.asin(Math.sin(lat) * Math.cos(distance / R) + Math.cos(lat) * Math.sin(distance / R) * Math.cos(brng));
  ...