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CircleTangentAt Method
Circles use trigonometric parameterization: t -> center + cos(t)*radius*xaxis + sin(t)*radius*yaxis.

Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.50000.0 (5.0.20693.0)
Syntax
public Vector3d TangentAt(
	double t
)

Parameters

t
Type: SystemDouble
Parameter of tangent to evaluate.

Return Value

Type: Vector3d
The tangent at the circle at the given parameter.
See Also