Foci of an Ellipse

Written by Jerry Ratzlaff on . Posted in Plane Geometry

ellipse foci 1hollow ellipse s major s minor 3Foci 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

\(\large{ c^2 = a^2 - b^2  }\)  

Where:

 Units English SI
\(\large{ c }\) = length center to focus \(\large{ in }\) \(\large{mm  }\)
\(\large{ a }\) = length semi-major axis \(\large{ in }\) \(\large{mm  }\)
\(\large{ b }\) = length semi-minor axis \(\large{ in }\) \(\large{mm  }\)
\(\large{ F }\) and \(\large{ G }\) = focus - -

 

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