What change is observed in both width and height in area #21?

The correct answer highlights that there is a change in both width and height observed in area #21. In the context of this question, a change in both dimensions suggests that the area has undergone an alteration that affects its overall size and possibly its appearance or function. This could indicate a structural transformation, an expansion, or a contraction that impacts how the area is utilized or visualized.

The significance of recognizing both measurements is crucial in various applications, such as architectural design, landscape planning, or any field where spatial dimensions are a primary concern. By noting changes in both attributes, one gets a comprehensive understanding of the modifications taking place in that area.

Observing changes in color, depth, or no significant change would not encapsulate the specific dimensional alterations referenced in the question. Therefore, recognizing that the observed adjustments encompass both width and height provides clarity on the extent and nature of the changes within area #21.