Heptagon is not constructable by rule and compass theoretically. But there is some classic method to construct Heptagon with small error about one tenth degree.(Dixon)
I find a way which much much better close to perfect Heptagon with error -0.0018 degree. details see the picture at right.
I write down the detail step in the picture.
I found out this method by study the 12 orthogons recently. Actually, I found a another way with pentagon first which I will post later.
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