Hi Anis,
> How to close this area using curves provided
Right now you have the bottom curve split into 4 segments with 2 longer curves that cross each other.
Instead, join the bottom curve together into one closed curve, and use Trim to cut the 2 longer curves so that they are 4 pieces that touch at the top, then you can select them all and run Construct / Network. See the attached file anis_network.3dm . There seems to be a bug when doing a window select of the curves though, try clicking on them one by one to select them in this particular case, I will see if I can find out why window selection is not working for this one.
> Also I cant use fillet>const dist on the "joined model".
You mean the model to the left that has the modified sphere in it? It appears to have a fillet placed in it already. Fillets can only be applied to sharp edges, if you have already filleted an edge then you can't fillet it again.
EDIT: updated attachment
- Michael
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