1. Definition
An ellipse has x=a cosθ, y=b sinθ, where θ is the eccentric angle (not the point polar angle).
3. Properties & Laws
- Parametric form;
- Eliminate to standard ellipse;
- Not the polar angle;
- a=b gives a circle.
4. Steps
- Enter a,b,θ;
- Click "Point";
- Or click "Load Example".
5. Worked Examples
Example: 5,4,θ=60: (2.5,3.46).
6. Common Pitfalls
Eccentric ≠ polar angle;
Use b for y;
Positive.