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To determine the distance $d$ from the point $P\left(x_{1}, y_{1}\right)$ to the line $A x+B y+C=0,$ proceed as follows: Consider Figure 15 .Assume neither $A$ nor $B$ is zero. (If either was zero, the problem is trivial, why?) Draw the vertical line from $P$ to $T$. (a) Show that $\angle P S R=\angle T S W$, (b) Show that$\angle R P S=\angle S W T .$ (c) Show that $\Delta P R S$ is similar to triangle $\Delta W O Q$. (d) Find the coordinates of $Q, W$ and $S$. (e) By similarity, conclude that $$\frac{d}{O W}=\frac{P R}{Q W}$$ (e) Substitute for these distances and simplify, to show that $d=\frac{\left|A x_{1}+B y+C\right|}{\sqrt{A^{2}+B^{2}}}$ (Note, the absolute value was included as distance must always be positive.)

Calculus 1 / AB

Chapter 2

An Introduction to Calculus

Section 9

Elements of Geometry

Derivatives

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Lectures

04:40

In mathematics, a derivative is a measure of how a function changes as its input changes. Loosely speaking, a derivative can be thought of as how much one quantity is changing in response to changes in some other quantity; for example, the derivative of the position of a moving object with respect to time is the object's velocity. The concept of a derivative developed as a way to measure the steepness of a curve; the concept was ultimately generalized and now "derivative" is often used to refer to the relationship between two variables, independent and dependent, and to various related notions, such as the differential.

30:01

In mathematics, the derivative of a function of a real variable measures the sensitivity to change of the function value (the rate of change of the value of the function). If the derivative of a function at a chosen input value equals a constant value, the function is said to be a constant function. In this case the derivative itself is the constant of the function, and is called the constant of integration.

03:33

Distance between a point a…

23:34

The distance from a point …

04:23

05:32

Point to Line Let $P$ be a…

05:18

Generalizing the Distance …

01:06

The distance of a point $P…

05:25

Verify the Distance Formul…

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