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An Interactive Procedure for Constructing Line and Circle Tangencies
April 1986 (vol. 6 no. 4)
pp. 59-63
Dwight Freund, Califomia State University, Sacramento
This note describes a procedure that enables a designer or draftsperson with limited mathematical training to discover interactively the construction of a wide variety of tangency and intersection problems. Requiring very little code to implement, it supplements the standard tangency constructions available on commercial turnkey computer-aided-design systems with a flexibility unavailable even through the inclusion of the numerous special-purpose algorithms available in the literature.

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Dwight Freund, "An Interactive Procedure for Constructing Line and Circle Tangencies," IEEE Computer Graphics and Applications, vol. 6, no. 4, pp. 59-63, April 1986, doi:10.1109/MCG.1986.276721
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