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Euler-vonal, Feuerbach-kör
Az Euler-vonal és a Feuerbach-kör (9 pont köre) megjelenítése háromszögekben.
A gomb megnyomásakor új háromszög generálódik, bal oldalon beállíthatod, hogy a háromszög mely vonalai, körei, esetleg pontjai látszódjanak.