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Through a Point, Parallel/Perpendicular to a Line Example

Creating several lines, which are parallel or perpendicular to a line (LN1) and pass thru a previously defined point.

$$
$$ Declaration
$$
    ENTITY/PT1,PT2,LN1,LN2,LN3,LN4
$$
$$ Point Definition
$$
    PT1=POINT/0,-.5
    PT2=POINT/0,.5
    LN1=LINE/-1,-.5,0,.5
$$
$$ Line Definition
$$
    LN2=LINE/PT1,PARLEL,LN1
    LN3=LINE/PT1,PERPTO,LN1
    LN4=LINE/PT2,PERPTO,LN1

Lines through Points, Parallel or Perpendicular to a Line