Final answer:
The ellipse described is actually a circle, with both the major and minor axes being 4 units in length and the semi-major axis being 2 units. Orientation is not applicable as it is the same from all sides.
Step-by-step explanation:
If an ellipse has a center at (5,5), a minor axis of length 4, and a vertex at (5,5), we can infer several things about the ellipse's features. First, because the ellipse's vertex is at its center, this means that the ellipse must be a circle, as only in a circle are all vertices also the center. Hence, the major axis and minor axis would be equal. Since the minor axis is given as 4, the major axis is also 4, making the semi-major axis 2 (half of the major axis).
The orientation of the ellipse in this scenario is irrelevant as it is a circle and appears the same from all directions.