We contruct conjugate diameters. The triangle formed by the conjugate radii and the line connecting the tangecy points has constant area.
Also, the areas of the two triangles formed by the projections of the conjugate radii onto the axis of the ellipse are equal. (not shown)
Expressions
| Name | Input | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Area |  |
 |
 |
 |
 |
 |
 |
 |
 |
