Support for operations like: nurbs, brep or fillets.Although the version available for download here runs on Windows, there are versions that run on Linux or Mac with exact same functionality.It relies on OpenCasCade, a very popular geometry kernel.Here’s what you need to know about FreeCAD: FreeCAD is Open Source, which means any developer is welcomed to contribute and extend the modular functionality with new extensions and customizations. This program will benefit the most product designers and engineers. So i suppose this is a bug (partial redundant constraints causing breakage).You can use FreeCAD if you want to create virtual 2D or 3D models for CAx, CAD, CAE, MCAD or PLM. However your project assumes that the arc is a half circle (you used tangency constraints at the 2 points), which isn't always the case. The project you attached is correct indeed, as is my example project with the partial redundancy removed. So this should fully constrain the arc, and as chrisb had pointed out, the issue is caused by partial constraint redundancy, and not lack of constraints. The whole arc is created as external geometry in the 2nd sketch, and the normal arc is created using the external center and 2 points. The arc in the master sketch is defined through center + 2 points (a center with 2 points define exactly an arc, actually 2 complementary arcs). You need here to refer to the center and one end of the 1st arc. You cannot copy an arc with 3 points : an arc is 5 Degrees of Freedom (dof) and 3 points are 6 dof.
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