Book excerpt: This book is your AutoCAD 2020 Instructor. The objective of this book is to provide you with extensive knowledge of AutoCAD, whether you are taking an instructor-led course or learning on your own. AutoCAD 2020 Instructor maintains the pedagogy and in-depth coverage that have always been the hallmark of the Leach texts. As the top-selling university textbook for almost a decade, the AutoCAD Instructor series continues to deliver broad coverage of AutoCAD in a structured, easy-to-comprehend manner. AutoCAD 2020 Instructor is command-oriented, just like AutoCAD. Chapters are structured around related commands, similar to the organization of AutoCAD’s menu system. The sequence of chapters starts with fundamental drawing commands and skills and then progresses to more elaborate procedures and specialized applications. The writing style introduces small pieces of information explained in simple form, and then builds on that knowledge to deliver more complex drawing strategies, requiring a synthesis of earlier concepts. Over 2000 figures illustrate the commands, features, and ideas. AutoCAD 2020 Instructor is an ideal reference guide, unlike tutorial-oriented books where specific information is hard to relocate. Because these chapters focus on related commands, and complete coverage for each command is given in one place, the commands, procedures, and applications are easy to reference. Tabbed pages help locate tables, lists, appendices, and the comprehensive index. What makes this book unique? • In depth coverage of AutoCAD 2020 commands and features • Command Tables indicate where to locate and how to start each command • TIP markers in the margin provide important tips, notes, reminders, short-cuts and identify what's new • Complete chapter exercises with many multi-chapter “REUSE” problems • Well suited for a two or three course sequence Online Resources Your purchase of AutoCAD 2020 Instructor includes three free exclusive bonus chapters that are available by redeeming the unique access code found on the inside of the front cover. These bonus chapters cover geometric constraints, dynamic blocks and express tools. Chapter exercises drawings and additional student questions are available for free.