Apparently, it is possible to make a perfect icosagon which is a 20 sided polygon. This shows my common method I use where I first make a square, and then rotate them to form a shape. In fact, I could be using the polygon tool but it's kinda neat this way. More... 双面 多边形 Icosagon
5 overlapped triangles arranged to make a pentagon but also a cool pentagram in the middle 5 重叠 三角形 5 重叠的三角形
this is as close as you can get making a pentagon with triangles that don't overlap, that is with them pointing inward towards the center 五角大楼 三角形 几乎五角大楼
I haven't been uploading things lately to openclipart since I'm trying to sell my art, but this is a very special one that I think should be shared with the world. There are some amazing illusions that can be done and this is one of them. 神圣 双 五角大楼 神圣的双五角大楼
