TangencyIntroductionTangent lines, arcs, circles, or surfaces are lines, arcs, circles, or surfacesthat touch but do not intersect. When drawing irregular or noncircularcurves with french curves, you plot a series of tangent arcs. When youindicate round corners on an otherwise straight plane, you are working withan arc that is tangent to two lines at right angles. Make sure all points oftangency are clearly defined before you begin inking.To draw acircle tangentTo draw a circle tangent to a line at a given point, follow this table:to a lineStepAction1Given line AB with point P representing the point of tangency,erect a perpendicular.2Set off the length of the radius of the required circle as a point onthe perpendicular and mark it C.3Draw the circle using C as the center point and CP as the radius.Figure 2-26 shows how to draw a circle tangent to a line.Figure 2-26.—A circletangent to a line.Continued on next page2-27

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