# What are secants in circles?

Table of Contents

## What are secants in circles?

In geometry, a secant is a line that intersects a curve at a minimum of two distinct points. The word secant comes from the Latin word secare, meaning to cut. In the case of a circle, a secant intersects the circle at exactly two points.

## How are secants and tangents to a circle alike and different?

A line that intersects a circle in exactly one point is called a tangent and the point where the intersection occurs is called the point of tangency. The tangent is always perpendicular to the radius drawn to the point of tangency. A secant is a line that intersects a circle in exactly two points.

## When two secants intersect they intersect at the center of a circle?

When two chords intersect at a point on the circle, an inscribed angle is. formed.

## What is the formula for intersecting secants and tangents?

If a tangent and a secant are drawn from a common point outside the circle (and the segments are labeled like the picture below), then a2=b(b+c).

## At what point does each circle intersect circles?

The secant of a circle is a line or line segment that intersects the circle at two points.

## Are two circles with the same center congruent?

A circle is named by its center. The diameter of a circle is a chord that does not always pass through the center of the circle. Circles in the same plane and having the same center are called congruent circles. Two circles are congruent if their centers are the same.

## What is the highest number of common secants two circles could have?

Spend a few seconds drawing common secants and you will find that there is no maximum number of secant lines two circles can have in common. You could keep on drawing them for the rest of your life if you wanted to.

## Is it true when two chords intersect they intersect at the center of the circle?

Each chord is cut into two segments at the point of where they intersect. One chord is cut into two line segments A and B. The other into the segments C and D. As long as they intersect inside the circle, you can see from the calculations that the theorem is always true.

## Where does the secant lie in a circle?

A secant intersects the circle at two points and tangent intersects the circles at one point. Both tangent and secant can be extended but parts of secant lie inside the circle and parts of secant lie outside the circle whereas tangent lies outside the circle completely.

## How are intercepted arcs different from tangents and secants?

In one way, this case seems to differ from the others– because all circle is included in the intercepted arcs. Since both of the lines are tangents, they touch the circle in one point and therefore they do not ‘cut off’ any parts of the circle.

## How to deal with chords, secants, tangents in circles?

Rules for Dealing with Chords, Secants, Tangents in Circles Intersecting Chords: a b c d (segment part) • (segment part) = (segment part) • (segment part) If two chords intersect in a circle, the product of the lengths of the segments of one chord equal the product of the segments of the other Ex. 1: Finding Segment Lengths

## What is the measure of the two secants?

In the picture below, the measure of ∠ x is 1 2 the difference of the arcs intercepted by the two secants. Remember that this theorem only makes use of the intercepted arcs.