In case you need it at some point, here's the obtuse equivalent:

#macro drawObtuseArc(centre, arcSweepStart, arcSweepEnd, arcRadius,
borderWidth)
  #local arcDepth = 0.1;
  #local arcNorm = vcross(arcSweepStart,arcSweepEnd);

  difference{
    cylinder{ centre - arcDepth * arcNorm, centre + arcDepth * arcNorm,
arcRadius }
    intersection {
      plane{ -arcSweepStart, 0 translate centre }
      plane{ -arcSweepEnd, 0 translate centre}
    }
    pigment {rgbf <1,0,0,0>}
   }
#end

-- 
Mike Williams
Gentleman of Leisure

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