title: Adding a square polygon of a set size around a point using leaflet.js
body: <p>Bit of a weird one I hope someone can help out with.</p>
  
  <p>In leaflet, once the user has entered a lat/lng and added a point to the map I want to be able to also add a 10km square around that point.</p>
  
  <p>I've tried looking around for a calculation to find the corners of the square x Km away but haven't dug anything up. But surely there's an easier way!</p>
  
  <p>Does anyone have any thoughts? It'd be lovely to just say L.polygon then pass in a centre point and a square size.</p>
  
  <p>Thanks,</p>
  
  <p>Tayler</p>