Hi all,
Here is a new plugin that adds 13 commands to the "Draw" menu, to draw arcs, circles, polygons and ellipse, entering points, radius, length, angle, tangent, accuracy (number of segments).
Please see "HowToLocalise.txt" in the Resources folder of DBUR_ArcsCircles if you want to translate the plugin to your own language

v2.0.0 First release.
v2.0.1 Updated July 18th 2013: you can drax draw inside groups or components, and on groups or components faces (was buggy).
v2.0.2 Updated August 23rd 2013: VCB length input glitch corrected.
v3.0.0 last version published at the plugin store, Jan 15 2023
Enjoy,
Also now available at the SCF Plugins Store http://sketchucation.com/resources/pluginstore?pln=DBUR_ArcsCircles OR through the SketchUcation Plugin Store dialog within SketchUp itself... http://sketchucation.com/resources/plugin-store-download
Also published at the Extension WareHouse.