Can a circle be filled with a triangle fan? When a cylinder is added to a scene Triangle Fan fill type for the cap is provided in the last operator panel.



Is there any tool to use with a circle to fill it like triangle fan would do?



The alternatives Grid Fill and F (n-gon) can't be used when the vertex in the center of the circle is required.
Create and poke face

You can do this with 2 operations.

F, &#9095; AltP


F (creates a face)
&#9095; AltP (poke face, creating a triangle fan)


See: Mesh -> Face menu for both.

Note for Blender 2.80 users: Shortcut for Poke Faces was removed and the menu entry relocated to Face -> Poke Faces.

Extrude and merge edges

E, Escape, &#9095; AltM, A


E (Extrude)
&#9095; AltM (Merge)


A (Menu accelerator for the  A&#818;t Center option)



Note:


Create face &amp; Poke will assign UV's &amp; vertex colors from surrounding faces (the extrude method will simply extend UV's/colors, which may not be what you want).
Poke uses a more advanced method to calculate the face center point(noticeable when edges aren't evenly spaced).