Foci of an Ellipse

Written by Jerry Ratzlaff on . Posted in Plane Geometry

ellipse 3cFoci is a point used to define the conic section.  F and G seperately are called "focus", both togeather are called "foci".

Foci of an Ellipse formula

\(\large{ c^2 = a^2 - b^2  }\)        


\(\large{ c }\) = length center to focus

\(\large{ a }\) = length semi-major axis

\(\large{ b }\) = length semi-minor axis

\(\large{ F }\) and \(\large{ G }\) = focus