One way is with the Manipulate Origins option:
- Center the origin of the wedge(s) by pressing ⎈ Ctrl⎇ Alt⇧ ShiftC> Origin to Geometry.
- Enable Manipulate Center Points (⎇ Alt
- Set the Pivot Point to 3D cursor (
.). Ensure the cursor is in the center of the circle.
- In object mode with the wedge(s) selected, scale them outward (S).
This works for multiple wedges at once:
You know that your wedge is 60°.
So first set the pivot point to 3D cursor, then rotate the wedge in edit mode 30° (so it is straight along the Y axis). Then in object mode mode rotate it back 30° to its original spot.
Then when you change the Transform Orientation to Local you can move the wedge out from the center.