Final answer:
True, perspective drawings are commonly used in aircraft design to visualize three-dimensional objects on two-dimensional media, a practice that has been enhanced by the use of CAD systems.
Step-by-step explanation:
The statement perspective drawings are usually used in aircraft drawings is true. In engineering, particularly in the design of complex structures like aircraft, perspective drawings are essential for visualizing three-dimensional objects on two-dimensional media. The development of linear perspective during the Renaissance allowed for a geometrical understanding of space, enabling artists and engineers to create realistic and accurate representations of three-dimensional structures on two-dimensional surfaces. This technique has evolved with the help of computer-aided design (CAD) systems, such as CATIA used in the Boeing 777's design process, which incorporate advanced perspective methods to allow engineers to visualize, design, and test fit parts virtually, significantly accelerating the pace of development.