how to draw those nonconstructive polygon with a pentagon

The pentagon is a good polygon which you can find lots of interesting staff. I had found some interesting points which can be used to setup those nonconstructive polygon very quickly.

The main idea is to draw a red line so you can get two points which can be used to create the central angel of those polygons.

To find other special points, the orange segment means to get midpoint of the whole segment. yellow segment means to get half of the half segment.

I list all those polygon that I drawed before. I found these quick method one month before I find the self accurate method.

I think it is interesting to do it so I post all these method.

12 orthogons---part 5: Penton

Penton is pentagon. It is most interesting orthogon among the 12s. It is confused me a long time for the ratio. I think the wiki ration might be wrong as I mentioned before. To check all the possible rectangle, the most like one is that the dark blue one in the picture. You can see it is same with 4 small rectangles. So the Bipeton has two possibilities also: one is 70° and another is 55.5°. this will explain the penton ratio reasonably.