Example of dimensions and parameters in a sketch

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Two circles, to form a tube, later. Change the names from d1 and d2 then add a thickness:





Now, to change InnerDiam into a driven dimension:






And you'll get a tiny dialog where you can type in a formula:





Click on the green tick. You'll see the driven dimension:



Text, images and diagrams © 2021 Owen F. Ransen. All rights reserved. (But copy the source code as much as you want!)