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Circle Constructor (Point3d, Vector3d, Point3d)
Initializes a circle from two 3d points and a tangent at the first point. The start/end of the circle is at point "startPoint".

Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.50000.0 (5.0.20693.0)
Syntax
public Circle(
	Point3d startPoint,
	Vector3d tangentAtP,
	Point3d pointOnCircle
)

Parameters

startPoint
Type: Rhino.GeometryPoint3d
Start point of circle.
tangentAtP
Type: Rhino.GeometryVector3d
Tangent vector at start.
pointOnCircle
Type: Rhino.GeometryPoint3d
Point coincident with desired circle.
Remarks
May create an Invalid circle
See Also