Tangency

To draw a line tangent to a circle through a point

Illustrator Draftsman 3 & 2 - Volume 2 Standard Practices and Theory
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Tangency Introduction Tangent lines, arcs, circles, or surfaces are lines, arcs, circles, or surfaces that touch but do not intersect. When drawing irregular or noncircular curves with french curves, you plot a series of tangent arcs. When you indicate round corners on an otherwise straight plane, you are working with an arc that is tangent to two lines at right angles. Make sure all points of tangency are clearly defined before you begin inking. To draw a circle tangent To draw a circle tangent to a line at a given point, follow this table: to a line Step Action 1 Given line AB with point P representing the point of tangency, erect a perpendicular. 2 Set off the length of the radius of the required circle as a point on the perpendicular and mark it C. 3 Draw 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 circle tangent to a line. Continued on next page 2-27

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