Try this instead:
Click Insert > Pictures > Clipart.
Search for "Chord" or "Semi".
Select the first result and you will get a semi circle.
You can remove the shadow through the shadow feature.
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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: July 19, 2007
(All amazing PowerPoint skills here <g>) http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate