Question

the size of the fillet is determined by setting the desired _________.
arc
depth
radius
circumference

Explanation:

In engineering and design, the size of a fillet (a rounded - edge) is determined by its radius. The radius defines how sharp or rounded the corner is. An arc is a part of a circle, depth is not the standard measure for fillet size, and circumference is the perimeter of a circle which is not relevant for defining fillet size.

Answer:

C. Radius