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6.7.6 Circles

Circles are represented by a center point and a radius. Values of type circle are specified using the following syntax:

< ( x , y ) , r >
( ( x , y ) , r )
  ( x , y ) , r
    x , y   , r

where (x,y) is the center and r is the radius of the circle.

Circles are output using the first syntax.