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.
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