What is a key characteristic of a rectangular sheaf?

A rectangular sheaf is characterized by its dimensions, specifically the relationship between its length and width. In the context of military operations and artillery, a rectangular sheaf typically implies that the length of the target area must exceed a certain measurement—200 meters in this case. This length provides the necessary coverage for effective targeting and ensures that the area is sufficiently long to encompass the intended target zone.

In contrast, the other options do not accurately describe the necessary characteristics for a rectangular sheaf. For instance, stipulating that the width must be less than 100 meters or that both dimensions must be less than 200 meters would overly restrict the flexibility needed for different operational scenarios. Similarly, defining a sheaf as having a circular shape contradicts the very definition of a rectangular sheaf, which requires it to have a defined length and width rather than a radius. Thus, focusing on the key characteristic of length exceeding 200 meters aligns with the operational requirements for effective artillery deployment.