r422

Let A+, B+, C+ be the apices of the Fermat external triangles, A-, B-, C- the same of the internal ones. The triangles A+B+C+ , A-B-C- and the excentral triangle are perspective, with centers at the line HMt (H orthocenter, Mt Mittenpunkt) and IIs (I incenter, Is an isodynamic point).


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