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Through a Point, Perpendicular to a Curve/Surface Example 1

Creating two lines from previously defined points perpendicular to a circle.

LN1 is created from PT1 to the circle. LN2 is created thru the circle because PT2 was already on the circle's circumference.

$$
$$ Declaration
$$
    ENTITY/PT1,PT2,CR1,LN1,LN2
$$
$$ Point Definition
$$
    PT1=POINT/-1.5,0
    CR1=CIRCLE/0,0,.5
    PT2=POINT/CR1,ATANGL,135
$$
$$ Line Definition
$$
    LN1=LINE/PT1,PT2,PERPTO,CR1
    LN2=LINE/PT2,PT2,PERPTO,CR1

Lines through Points Perpendicular to an Arc