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Curve Conic 
The Conic command draws a conic section curve based on a start, end, and apex point. The default is to first pick a start point, then an end point, and then an apex point.
Commandline options  

Apex 
Lets you specify the apex point before you pick the endpoint of the conic curve. Apex steps

Lets you select a curve for the conic curve to be tangent to for the start or end of the conic. Steps


Lets you select a curve for the conic to be perpendicular to for the start or end of the conic. Steps


Type subcrv to select part of a curve as input. 
Draw a hyperbolic curve from focus points, vertices, or coefficient.
Draw a parabolic curve from focus and vertex or endpoint.
Rhinoceros 6 © 20102019 Robert McNeel & Associates. 12Apr2019