So `b = 1` and `a = 5`. In this example, the major axis is vertical.

So the vertices are at `(0, -5)` and `(0, 5)`.

To find c, we proceed as before:





So the foci are at `(0, -4.9)` and `(0, 4.9)`.


The foci (green dots) are very close to the vertices in this ellipse.

Easy to understand math videos: