A tangent line is a straight line that intersects with a curve at exactly one point. It is an important concept in mathematics and is used in many different branches, from geometry to calculus. In this article, we will discuss the concept of a tangent line and how it relates to a curve that has only one point in common with it.

## Tangent Lines

A tangent line is a line that touches a curve at one point, but does not cross it. This is different from a secant line, which intersects a curve at two points. A tangent line is always perpendicular to the curve at the point of contact.

The concept of a tangent line is important in mathematics because it allows us to measure the slope of a curve at a given point. This can be used to calculate the rate of change of a function and to solve various problems in calculus.

## Point of Intersection

The point of intersection between a tangent line and a curve is known as the tangent point. This point is important because it is the only point where the tangent line and the curve have something in common.

The tangent point is also the point where the tangent line has the steepest slope. This means that the rate of change of the curve is greatest at this point. This is an important concept in calculus and is used to solve various problems.

In conclusion, a tangent line is a straight line that intersects with a curve at exactly one point. This point is known as the tangent point and is the only point where the tangent line and the curve have something in common. The tangent point is also the point where the tangent line has the steepest slope, which is important in calculus. Understanding the concept of a tangent line is essential for solving problems in mathematics.