Tangency, ContinuedTo draw an arctangent to twolines at rightanglesIt is impractical to draw small radii arcs by tangency construction. For smallradii or radii up to 5/8ths inch, draw a 45° bisector of the angle and locatethe arc by trial and error. You may also use a circle template so long as thediameter of the circle precisely equals twice the required radius.To draw an arc tangent to two lines at right angles. follow this table:StepAction1Given two lines at right angles to each other, strike an arc at aselected radius intersecting the lines at tangent points T.2With the same selected radius and using points T as centers, strikeanother arc to intersect at a point C.3With C as a center, use the selected radius to draw the requiredtangent arc.Figure 2-29 shows the process for drawing an arc tangent to two lines at rightangles.Figure 2-29.—Drawing an arc tangent to a right angle.Continued on next page2-30
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