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### Two Airplanes

```
Date: 08/28/97 at 19:27:44
From: james gilbert
Subject: Trigonometry/algebra III

Airplane A is located 3 miles west and 1 mile south of airport O.
Airplane B is located 5 miles due north of the airport at the same
altitude as airplane A. Draw a diagram using coordinate system with
origin O. How far apart are the two airplanes? Express the answer in
```

```
Date: 08/29/97 at 08:15:50
From: Doctor Jerry
Subject: Re: Trigonometry/algebra III

Hi James,

You can plot (-3,-1) for A and (0,5) for B, with the airport at (0,0).
Use the distance formula to calculate how far apart A and B are.

The distance formula is d=sqrt((x2-x1)^2+(y2-y1)^2), where (x1,y1) and
(x2,y2) are the two points.

-Doctor Jerry,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/
```
Associated Topics:
High School Basic Algebra
High School Trigonometry

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