Parabola je křivka, která má od dané přímky a od daného bodu, který na té přímce neleží, konstantní vzdálenost.
Bod F je ohnisko paraboly
d je řídicí přímka paraboly
Bod F neleží na d
Přímka FD se nazývá osa paraboly, je kolmá k řídící přímce d a prochází ohniskem F
Bod V je vrchol paraboly a nachází se ve středu úsečky FD
Délku úsečky FD nazýváme parametrem paraboly a značíme ji p, jedná se o vzdálenost ohniska od řídící přímky (|FD|=p)
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