## What are the 3 key theorems about a tangent to a circle?

1) A tangent is perpendicular to the radius at the point of tangency. 2) Tangent segments to an external point of a circle are equal. 3) The angle between a tangent and a chord is equal to the inscribed angle on the opposite side of that chord.

**Which is an example of a tangent line?**

For example, the tangent line to the straight line y=−3x+2 is y=−3x+2 at every point on the straight line. The tangent line can be thought of as a limit of secant lines. which means that as Q approaches P the “limit” of the secant line LPQ has the same slope and goes through the same point P as the tangent line TP.

### What is tangent property?

Tangent Properties The tangent always touches the circle at a single point. It is perpendicular to the radius of the circle at the point of tangency. It never intersects the circle at two points. The length of tangents from an external point to a circle are equal.

**What is the tangent line problem?**

Definition: A tangent line is a line that “just touches” a curve at a specific point without intersecting it. Figure 1: In this diagram, the line is tangent to point “A”, but not to point “B.” Finding the equation of a tangent line to a curve at a specific point.

#### How do you solve a tangent line problem in calculus?

1) Find the first derivative of f(x). 2) Plug x value of the indicated point into f ‘(x) to find the slope at x. 3) Plug x value into f(x) to find the y coordinate of the tangent point. 4) Combine the slope from step 2 and point from step 3 using the point-slope formula to find the equation for the tangent line.

**What is tangent property of a circle?**

## How do you find the equation of a tangent line example?

Examples

- Suppose f(x)=x3. Find the equation of the tangent line at the point where x=2.
- f(2)=23=8.
- The point is (2,8).
- f′(x)=3×2⟶f′(2)=3(22)=12.
- y−8=12(x−2)

**What is tangent and its example?**

Tangent is something or a thought that touches but doesn’t intersect, or is irrelevant. An example of a tangent is someone talking about a problem at work and then suddenly starts talking about something that happened to them in elementary school.

### What is the equation of a tangent?

A tangent to a circle at point P with coordinates is a straight line that touches the circle at P. The tangent is perpendicular to the radius which joins the centre of the circle to the point P. As the tangent is a straight line, the equation of the tangent will be of the form y = m x + c .

**How do you solve for the slope of a tangent line?**

- Figure out the slope of the tangent line. This is m=f′(a)=limx→af(x)−f(a)x−a=limh→0f(a+h)−f(a)h.
- Use the point-slope formula y−y0=m(x−x0) to get the equation of the line: y−f(a)=m(x−a).

#### What is tangent line problem?

Essentially, the problem of finding the tangent line at a point P boils down to the problem of finding the slope of the tangent line at point P. You can approximate this slope using a secant line through the point of tangency and a second point on the curve as in the following Fig. 10.5.