Which sketch type involves a flat, orthographic front with depth lines receding at a selected angle, typically 45 degrees?

The type of sketch that features a flat, orthographic front with depth lines that recede at a selected angle, often 45 degrees, is the oblique sketch. This sketching technique allows the front view of an object to remain true to its proportions while projecting the depth dimension at an angle, creating a more dynamic representation of three-dimensionality. The angle of the receding lines is typically chosen to enhance the visual effect and maintain clarity.

This method is particularly useful in technical drawings where a simple representation of the object is desired without the complexities of perspective. Unlike isometric sketches, which evenly space depth lines at angles of 120 degrees, or multiview drawings that show multiple orthographic views without depth representation, the oblique sketch effectively combines elements of 2D representation with indications of depth, making it distinct in its presentation.