How many sides and corners does a ellipse have?
If this is a homework assignment, please consider trying to answer it yourself first, otherwise the value of the reinforcement of the lesson offered by the assignment will be lost on you.
An ellipse has no sides and no corners. It is a smooth, continuous function, with no discontinuities. (This answer depends on your definition of a side - if you mean that a side is a straight line, then it is true, if not, then an ellipse has one side and no corners.)