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Speaking of millimeters, here’s another choice you have to make even before you choose your units of measure — and that’s your system of measure.

Most of the world abandoned local systems of measure generations ago. Even widely adopted ones, like the imperial system, have mostly fallen by the wayside — except, of course where feet, inches, pounds, gallons, and degrees Fahrenheit still rule.

During drawing setup, you choose settings for length units (for measuring linear objects and distances) and angle units (for measuring angles between nonparallel objects or points on arcs or circles) in the Drawing Units dialog box, as shown in Figure 4-1. (I show you how to specify these settings in the section “ssss1,” later in this chapter.) AutoCAD’s length unit types are as follows:

 Architectural units are in feet and inches and use fractions to represent partial inches: for example, 12′3 1/2″. The base unit is the inch, unless otherwise specified, so when you enter a number like 147.5, AutoCAD will understand it to be 147 1/2″ or 12′3 1/2″.