another simple and accurat classic method to construction the Heptagon

I am happy to find another simple method with relative error 5.7E-9. it is only 6 steps. See the image for the details.

another simple way to construct Heptagon with hyper accuracy

I found another simple construction method for Heptagon with relative error 4.4E-8.,a tiny better solution than last one. Hope some one will enjoy it.