How Do I Draw a Circle in Google Earth Pro
This is the code I use in this example:
function drawArc(center, initialBearing, finalBearing, radius) { var d2r = Math.PI / 180; // degrees to radians var r2d = 180 / Math.PI; // radians to degrees var points = 32; // find the raidus in lat/lon var rlat = (radius / EarthRadiusMeters) * r2d; var rlng = rlat / Math.cos(center.lat() * d2r); var extp = new Array(); if (initialBearing > finalBearing) finalBearing += 360; var deltaBearing = finalBearing - initialBearing; deltaBearing = deltaBearing/points; for (var i=0; (i < points+1); i++) { extp.push(center.DestinationPoint(initialBearing + i*deltaBearing, radius)); bounds.extend(extp[extp.length-1]); } return extp; } Used like this, where startPoint is the start of the arc, endPoint is the end of the arc and centerPoint is the center, but you can specify center, angles and radius.
var arcPts = drawArc(centerPoint, centerPoint.Bearing(startPoint), centerPoint.Bearing(endPoint), centerPoint.distanceFrom(startPoint)); var piePoly = new google.maps.Polygon({ paths: [arcPts], strokeColor: "#00FF00", strokeOpacity: 0.5, strokeWeight: 2, fillColor: "#FF0000", fillOpacity: 0.35, map: map }); Ancillary functions, may no longer be necessary if you include the geometry library
var EarthRadiusMeters = 6378137.0; // meters /* Based the on the Latitude/longitude spherical geodesy formulae & scripts at http://www.movable-type.co.uk/scripts/latlong.html (c) Chris Veness 2002-2010 */ google.maps.LatLng.prototype.DestinationPoint = function (brng, dist) { var R = EarthRadiusMeters; // earth's mean radius in meters var brng = brng.toRad(); var lat1 = this.lat().toRad(), lon1 = this.lng().toRad(); var lat2 = Math.asin( Math.sin(lat1)*Math.cos(dist/R) + Math.cos(lat1)*Math.sin(dist/R)*Math.cos(brng) ); var lon2 = lon1 + Math.atan2(Math.sin(brng)*Math.sin(dist/R)*Math.cos(lat1), Math.cos(dist/R)-Math.sin(lat1)*Math.sin(lat2)); return new google.maps.LatLng(lat2.toDeg(), lon2.toDeg()); } // === A function which returns the bearing between two LatLng in radians === // === If v1 is null, it returns the bearing between the first and last vertex === // === If v1 is present but v2 is null, returns the bearing from v1 to the next vertex === // === If either vertex is out of range, returns void === google.maps.LatLng.prototype.Bearing = function(otherLatLng) { var from = this; var to = otherLatLng; if (from.equals(to)) { return 0; } var lat1 = from.latRadians(); var lon1 = from.lngRadians(); var lat2 = to.latRadians(); var lon2 = to.lngRadians(); var angle = - Math.atan2( Math.sin( lon1 - lon2 ) * Math.cos( lat2 ), Math.cos( lat1 ) * Math.sin( lat2 ) - Math.sin( lat1 ) * Math.cos( lat2 ) * Math.cos( lon1 - lon2 ) ); if ( angle < 0.0 ) angle += Math.PI * 2.0; if ( angle > Math.PI ) angle -= Math.PI * 2.0; return parseFloat(angle.toDeg()); } /** * Extend the Number object to convert degrees to radians * * @return {Number} Bearing in radians * @ignore */ Number.prototype.toRad = function () { return this * Math.PI / 180; }; /** * Extend the Number object to convert radians to degrees * * @return {Number} Bearing in degrees * @ignore */ Number.prototype.toDeg = function () { return this * 180 / Math.PI; }; /** * Normalize a heading in degrees to between 0 and +360 * * @return {Number} Return * @ignore */ Number.prototype.toBrng = function () { return (this.toDeg() + 360) % 360; }; 
code snippet (using geometry library):
How Do I Draw a Circle in Google Earth Pro
Source: https://stackoverflow.com/questions/24956616/draw-circles-arc-on-google-maps