Drawing in design is primarily used to convey ideas and communicate concepts visually. It allows designers to explore and express their ideas, and to communicate them effectively to others.

Color is not a fundamental element of drawing. The fundamental elements of drawing are line, shape, and texture.

Composition refers to the arrangement of elements in a drawing. It involves organizing the elements in a visually pleasing and meaningful way.

Center line is not a type of line used in drawing. Contour line, hatch line, and gesture line are all types of lines used in drawing.

Value refers to the relative lightness or darkness of an area in a drawing. It is one of the fundamental elements of drawing.

Perspective is used in drawing to create a sense of depth and realism. It allows the artist to represent three-dimensional objects on a two-dimensional surface.

Isometric perspective is not a type of perspective used in drawing. One-point perspective, two-point perspective, and three-point perspective are all types of perspective used in drawing.

Proportion refers to the relationship between the size of an object in a drawing and its actual size. It is important for creating visually pleasing and realistic drawings.

Rendering is not a type of drawing technique. Hatching, cross-hatching, and stippling are all types of drawing techniques.

Grids are used in drawing to simplify the drawing process. They help the artist to accurately position and proportion the elements of the drawing.

Watercolor is not a type of drawing medium. Pencil, charcoal, and ink are all types of drawing media.

Transferring is the term used to describe the process of transferring a drawing from one surface to another.

Technical drawing is not a type of drawing style. Realism, impressionism, and expressionism are all types of drawing styles.

The primary purpose of technical drawing is to provide detailed instructions for construction or manufacturing. It is used in engineering, architecture, and other technical fields.

Perspective drawing is not a type of technical drawing. Blueprint, schematic diagram, and assembly drawing are all types of technical drawings.