Foci of an Ellipse formula |
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| \( c^2 \;=\; a^2 - b^2 \) | ||
| Symbol | English | Metric |
| \( c \) = length center to focus | \( in \) | \( mm \) |
| \( a \) = length semi-major axis | \( in \) | \( mm \) |
| \( b \) = length semi-minor axis | \( in \) | \( mm \) |
- Foci is a point used to define the conic section. F and G seperately are called "focus", both togeather are called "foci".
