| Art gallery theorem  | 
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| How to use the applet ??? | 
| The applet is very easy to use : | 
| Enter your points , maximum 100. You will not be allowed to enter a point that will cause intersection in the polygon. (Remember that we are working with simple polygons.) | 
| Close the polygon by clicking on the first point you entered. | 
| The triangulation will appear and the vertices will be colored. A white circle surrounds vertices representing guards. | 
| You can toggle the display by clicking on the buttons below the applet. | 
| The undo button will remove the last point you entered. | 
| The reset button will delete the polygon allowing you to enter a new one. |