Auxiliary circle of an ellipse (Auxiliary circle: x²+y²=a² (major axis horizontal case))
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Auxiliary circle: x²+y²=a² (major axis horizontal case)
What each symbol means
| Symbol | What it stands for |
|---|---|
| a | Semi-major axis |
When to use this
Used with eccentric angle φ: P=(a cos φ, b sin φ) on ellipse.