Which of the following is not a type of drawing used in CAD?

The correct answer is that perspective drawing is not considered a type used in CAD systems primarily focused on technical drawing and detailed design.

In a CAD context, 2D, 3D, and 2.5D drawings serve specific functional purposes.

• 2D orthographic drawings are fundamental in technical drawing; they provide precise measurements and representations of objects in two dimensions. They are essential for manufacturing and engineering design, making them a staple in CAD applications.

• 3D drawings represent objects in three dimensions, capturing their height, width, and depth, which is critical for modeling complex shapes and designs in CAD.

• 2.5D isometric and oblique drawings combine elements of both 2D and 3D. These types provide a way to represent three-dimensional views without the complexities of full 3D modeling, commonly used for design visualization.

While perspective drawing effectively shows depth on a flat surface and is useful for artistic representations, it is less utilized in CAD for technical purposes. CAD primarily aims for accuracy and clarity, which is why the other three types are preferred for technical design.