Drawing Aids, ContinuedProtractorsTo use a protractor for laying off or measuring angles, follow this table:(Continued)StepAction1Place the protractor along a straight line CA.2Place the O degree mark at the vertex of the desired angle.3Locate the desired angle (b) and its corresponding compliment (d).4Draw line BD.Using four points of reference decreases the possibility of error inmeasurement.Figure 2-51 illustrates the stability of a four-point reference system.Figure 2-51. —Protracting an angle using four-point reference.Continued on next page2-43
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
