The internal ratio

2(Aθ+Bθ+Cθ)=360° ∴Aθ+Bθ+Cθ=180°. There’s strong selected. ax=y, dθ=dπ. If then a=y/x,dπ/θ=1, so that then x=y,θ=π, a=1,d=1. The result Ad=1.

The internal element.

a∧2+b∧2=c∧2 is theorem. If a∧2+b∧2+c∧2=θ, a∧2+b∧2+c∧2/θ=π. If sinθ/cosθ+tanθ/cosθ=sinθ/tanθ, Asinθ+Bcosθ=Ctanθ. If Asinθ+Bcosθ=Ctan, a∧2+b∧2+c∧2=dπr. 

The physical ratio 2

dπr＝πr∧d. It exchanges 1＝πr∧d/dπr or dπr/πr∧d＝1, consciquence 1＝πr∧d-1 or 1/πr∧d-1＝1. 1∧2＝1.