DiskSegment

DiskSegment[{x,y},r,{θ1,θ2}] represents the disk segment from angle θ1 to θ2 in a disk centered at {x,y} of radius r.

DiskSegment[{x,y},{rx,ry},{θ1,θ2}] represents the ellipse segment from angle θ1 to θ2 in an axis-aligned ellipse with semiaxes lengths rx and ry.

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