What is the purpose of the "FILLET" command?

The "FILLET" command is used to create a smooth, rounded transition between two intersecting lines or curves in a drawing. When you apply the FILLET command, it generates an arc with a specified radius that connects the endpoints of the lines, effectively rounding the corner where the two lines meet. This is particularly useful in architectural and engineering drawings where rounded corners are aesthetically preferable or required for structural reasons. The ability to specify the radius allows for precise control over the curvature, making it a versatile tool for creating various geometric shapes.

In contrast, other options serve different functions. For example, trimming lines at an angle refers to commands that cut lines to a specified length or angle without rounding them. Filling an area with a solid color involves hatching or solid-fill commands that are unrelated to the FILLET command's purpose. Stretching a line is a function that alters the length of a line rather than its shape. Therefore, the FILLET command distinctly stands out for its specific action of creating rounded corners between intersecting elements.