A straight line that intersects a circle at any two points is called the secant line to a circle.

The straight lines are often intersect the circles for some reasons in geometric mathematics. In some cases, the straight lines enter into the interior of the circles. In this case, a straight line can possibly intersect any circle at a maximum of two different points and the straight line is called the secant line to a circle.

When a straight line intersects a circle at two distinct points, the two points of the secant line lie on the circle.

$P$ and $Q$ are any two points on the circumference of a circle.

$\overleftrightarrow{FG}$ is a straight line and it intersects the circle at two points $P$ and $Q$. So, the straight line $\overleftrightarrow{FG}$ is known as a secant of the circle at points $P$ and $Q$.

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