Draw a circle and two lines parallel to a given line such that one is a tangent and the other is a secant to the circle.
(N/A) It can be observed from the figure that $AB$ and $CD$ are two parallel lines.
Line $AB$ intersects the circle at exactly two points,$P$ and $Q$. Therefore,line $AB$ is the secant of this circle.
Since line $CD$ intersects the circle at exactly one point,$R$,line $CD$ is the tangent to the circle.
Line $AB$ intersects the circle at exactly two points,$P$ and $Q$. Therefore,line $AB$ is the secant of this circle.
Since line $CD$ intersects the circle at exactly one point,$R$,line $CD$ is the tangent to the circle.
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