Ellipse: focal property SP + S'P (Sum of distances from any point on ellipse to the two foci is constant)
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Sum of distances from any point on ellipse to the two foci is constant 2a
What each symbol means
| Symbol | What it stands for |
|---|---|
| P | Point on ellipse |
| S,S' | Foci |
When to use this
Standard ellipse major axis length 2a.