d3.symbolTriangle The up-pointing triangle symbol type.
pie.endAngle([angle]) If angle is specified, sets the overall end angle of the pie to the specified function
area.lineX0() area.lineY0() Returns a new line
arc.padAngle([angle]) If angle is specified, sets the pad angle to the specified function or number and returns
d3.curveCardinalOpen(context)
d3.curveBasisOpen(context)
d3.curveMonotoneY(context)
radialArea.curve([curve]) Equivalent to area
stack.keys([keys]) If keys is specified, sets the keys accessor to the specified function or array and returns
d3.arc() Constructs a new arc generator with the default settings.
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