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Parallel/Perp to a Line, Tangent to a Curve Example

Creating several lines, which are parallel and perpendicular existing lines and tangent to a circle. Positional modifiers and a point are used to define which side of the circle the line should be tangent.

$$
$$ Declaration
$$
    ENTITY/PT1,PT2,CR1,LN(5)
$$
$$ Point Definition
$$
    PT1 =POINT/0,1
    PT2 =POINT/1,0
    CR1 =CIRCLE/0,0,.5
    LN(1)=LINE/-1,-1,1,-1
$$
$$ Line Definition
$$
    LN(2)=LINE/PARLEL,LN(1),PT1,TANTO,CR1 LN(3)=LINE/PARLEL,LN(1),YSMALL,TANTO,CR1
    LN(4)=LINE/PERPTO,LN(1),XSMALL,TANTO,CR1 LN(5)=LINE/PERPTO,LN(1),PT2,TANTO,CR1

Lines Parallel or Perpendicular to a Line and Tangent to a Curve