Table of Contents

## What is a Secant of a Circle?

A secant of a circle is a line that intersects a circle in two points.

## Secant of a Circle Definition

The secant of a circle is a line that intersects a circle at two points. The secant line is perpendicular to the radius at the point of intersection.

## Difference Between Secant and Chord:

A chord is a straight line segment that connects two points on a curve. A chord is always shorter than the radius of the circle.

A secant is a line that intersects a curve at two points. A secant is always longer than the radius of the circle.

## Difference Between Secant and Tangent:

The secant and tangent are two types of lines that intersect a curve at a single point. The secant is a line that intersects a curve at two points, while the tangent is a line that intersects a curve at just one point. The difference between the secant and tangent is that the secant is a line that intersects a curve at two points, while the tangent is a line that intersects a curve at just one point.

## Secant of a Circle Formula

The secant of a circle is a line segment that intersects a circle at two points. The formula for the secant of a circle is:

## The Theorem of Secants of a Circle

The theorem states that the secant of a circle is always perpendicular to the radius drawn to the point of intersection.’

## FAQs

Q: What is the secant of a circle?

A: A secant of a circle is a line that intersects the circle at two points.

Q: What is the difference between a secant and a tangent?

A: A secant intersects the circle at two points, while a tangent intersects the circle at only one point.

Q: What is the equation for finding the length of a secant?

A: The equation for finding the length of a secant is L = √(d₁ × d₂), where L is the length of the secant, and d₁ and d₂ are the distances from the center of the circle to the two points of intersection.

Q: How many secants can a circle have?

A: A circle can have an infinite number of secants.

Q: What is the relationship between secants and chords?

A: A chord is a line segment that connects two points on a circle, while a secant is a line that intersects the circle at two points, which includes chords as a special case where the two intersection points are the endpoints of the chord.

Q: How can secants be used to find angles?

A: By using the intersecting chord theorem, which states that the product of the lengths of the segments of two intersecting chords is equal, we can find angles formed by secants and chords. Additionally, the angle between a secant and a tangent can also be found using the theorem that states that the angle between a tangent and a chord is equal to the angle formed by the chord and the secant that intersects it.

Q: What is the power of a point theorem?

A: The power of a point theorem states that if a line (a secant or a tangent) intersects a circle at two points, then the product of the lengths of the segments of the line between the points of intersection is equal to the square of the length of the line segment from the point of intersection to the center of the circle.