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dynamic block intersection when changing angle


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I'm having a hard time finding the solution for my problem.


I want to create a dynamic block in Autocad 2014 In this block I need to determine the intersection between 2 lines.


In the sample you'll see my problem.

I want to make A, B and C variables in my block. The angle on top is always 90 degrees.

With this information I can draw everything, but I don't know how to make the intersection properly, and keep it clean when manipulating the variables.

Variable A has to be positive between 1 and 89 degrees, there are no restrictions on the variables C.


Any help is much appreciated



intersection problem.dwg

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