Drawing Problems - Chapter 4 Copyright Goodheart-Willcox Co., Inc. Chapter 4 Understanding Three-Dimensional Coordinates and User Coordinate Systems 109 5. Mechanical Create the mounting bracket shown. Save the file as P4-5. 6. Mechanical Create the computer speaker as shown below. The large-radius, arched surface is created by drawing a three-point arc. The second point of the arc passes through the point located by the .26 and 2.30 dimensions. Save the file as P4-6.