Final answer:
An excellent approximation for a two-dimensional object is to consider only the two-dimensional contour describing the object's boundary. This approximation is useful in various fields, including physics and biology.
Step-by-step explanation:
An excellent approximation for a two-dimensional object is to consider only the two-dimensional contour describing the object's boundary. By focusing on the shape and contour of the object, we can simplify calculations and analysis. This approximation is useful in various fields, including physics and biology, where objects can be approximated as two-dimensional for certain purposes.