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Perpendicular to a Curve, at a Point Example

Creating a plane object which is perpendicular to a previously defined line, and passes through a specified point.

$$
$$  Declarations
$$
    ENTITY/PT1,LN1,PL1
$$
$$ Geometry Definition
$$
    PT1=POINT/0,0,.5
    LN1=LINE/0,0,1,0,0,0
$$
$$ Plane Definition
$$
    PL1=PLANE/PERPTO,LN1,THRU,PT1

A Plane Perpendicular to a Line through a Point