I have these faces:
Now I'd like to add faces in a way that creates the shape of a chinese hand fan:
How can I achieve this?
This is my attempt with E+S (extrusion and scale), which is wrong:
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Instead of a S to scale try Alt+S (scale along local normals). Also you need to do it in two separate steps. First: E followed by RMB (RightMouseButton) to validate the extrusion but not move the vertices. Then Alt+S to scale out your fan shape.
So it is:
See gif below: