title: Concave and Convex Polygon - Turn arbitrary polygon into a convex polygon
body: <p>How can I <strong>identify and remove</strong> those four RED points drawn in image 
  <img src="https://i.stack.imgur.com/Y13y2.png" alt="alt text"></p>
  
  <p>Those four points make that polygon a concave polygon that’s why I want to remove it.</p>
  
  <p>My goal is to convert concave polygon to convex by removing this kind of point by identifying and removing those points.</p>
  
  <p>Is there any way to identify and remove these kind of points?</p>