Gary, thank you for presenting a more traditional approach.
The way I do this is to clone a semi-circle and rotate the required angle and Intersect to give one pie slice.
Your sum is a little wrong; it should be 18.947. Xara's input box will accept the 3 d.p.
Your method would be necessary for polygons over 99 sides.
Acorn
P.S. Major broadband so fighting through. I apologise if replies are terse.
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