The majority of your graphic problems can be solved using the basic trigonometric functions shown in this sample program. But AutoLISP provides the tools to solve even the most arcane Trigonometric problems. If you find you need to use these math trig functions, consider making liberal use of a sketch pad or for that matter, AutoCAD itself to document your program. You may want to re-use or modify programs such as the previous example and if you don't have some graphic documentation recording how it works, you can have a difficult time understanding why you wrote your program as you did.
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