Focal distance on parabola y² = 4ax (PS = x+a for focus S(a,0) and P(x,y) on parabola)
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PS = x+a for focus S(a,0) and P(x,y) on parabola
What each symbol means
| Symbol | What it stands for |
|---|---|
| P | Point on curve |
| S | Focus (a,0) |
When to use this
Standard orientation; use appropriate shift if translated.