Which sketch type is characterized by all three drawing axes forming equal angles of 120 degrees with the plane of projection?

The correct answer is the isometric sketch, which is defined by the unique arrangement of its axes. In an isometric sketch, the three drawing axes—representing the dimensions of width, depth, and height—are oriented so that they form equal angles of 120 degrees with the plane of projection. This arrangement allows for a more visually realistic representation of three-dimensional objects within a two-dimensional space. Each axis is scaled equally, providing a consistent and proportionate representation of dimensions, which makes it easier to visualize and construct three-dimensional objects.

In contrast, oblique sketches typically represent depth with a single angle and do not maintain equal angles among the axes. Multiview drawings provide different views of an object (such as top, front, and side), which do not follow the isometric rules and can illustrate dimensions without equal angular relationships. Pictorial sketches serve as more general representations of objects and may lack the precise mathematical scaling found in isometric sketches. Therefore, the defining characteristic of equal angles in an isometric sketch makes it the correct answer.