title: algorithm to find a certain lat long position in a polygon enclosed by lat/long postions or not
body: <p>I have a set of polygons drawn on google map,now I want to implement the algo that given a postion with certain lat/long in which of the polygon it lies.</p>
  
  <p>Note:polygons are also drawn given the lat/long positions using the google maps api</p>
  
  <p>So Is there any api for it or how can i convert lat/long positions to x-y planes so that i can check if a given point lies in which area using area formulas?</p>