It also has. This curved part here. Can is still be a polygon with that curve there? No! The curved part disqualifices it as a polygon. A polygon has to have only straight sides so that is not a polygon. And what about this guy here ? Is this a polygon? Well , it's just straight lines. But two of those lines cross,and if any lines cross it can't be a polygon. Plus ,he has this big open and here. So this guy is diffnitely not a polygon. And last of all , what about this one? Right you are this is not a polygon because it's a 3D shapes. Lt's made from polygon, but the whole shape is not a polygon it selt. Well, that's all the time we have for this week. Join us next week as we decide : Is it bigger than one? Okay , so after playing that game you have a really good idea of what a polygon is ,and what it is not. The last thing. I want to mention is that some polygonhave special names depending on how many sides they have.