# Figuring distance from Point A to Point B

16 replies to this topic

### #1 Eedis

Eedis
• Members
• 1591 posts

Posted 16 April 2011 - 12:57 AM

I posted this in General Chat as I am not asking for code, I just need the mathematical formula to figure out the problem.

I am two points, A and B. Given both the x and y coordinates and assuming the distance from x1 to x2 is 1P, what formula could I use to figure out the distance, in a straight line, from both points with completely different x coord's and y coord's. I figure I would need to figure the slope, but I have no idea where to go from there.

This is why I wish I paid more attention in Algebra.

### #2 codybear

codybear
• Members
• 589 posts

Posted 16 April 2011 - 01:00 AM

I posted this in General Chat as I am not asking for code, I just need the mathematical formula to figure out the problem.

I am two points, A and B. Given both the x and y coordinates and assuming the distance from x1 to x2 is 1P, what formula could I use to figure out the distance, in a straight line, from both points with completely different x coord's and y coord's. I figure I would need to figure the slope, but I have no idea where to go from there.

This is why I wish I paid more attention in Algebra.

Distance formula:

For more information: I got that image above from: <!-- m -->http://www.purplemat...es/distform.htm<!-- m -->
They usually have some good math tutorials at that site as I have used them to help tutor my friends in math along with a few others that have popped up during a google search.[/edit]

Hope this helps!

### #3 nimda

nimda
• Members
• 4301 posts

Posted 16 April 2011 - 01:03 AM

```X1:=0, Y1:=0, X2:=3, Y2:=3

distance := sqrt((y2-y1)**2+(X2-X1)**2)

MsgBox % Distance " should equal the square-root of 18:`n" sqrt(18)```

### #4 Eedis

Eedis
• Members
• 1591 posts

Posted 16 April 2011 - 01:03 AM

Awesome, thanks, I'll have to browse this for a bit.

### #5 codybear

codybear
• Members
• 589 posts

Posted 16 April 2011 - 01:12 AM

Stupid image...it worked at first, must be hotlink protected lol.

### #6 nimda

nimda
• Members
• 4301 posts

Posted 16 April 2011 - 01:27 AM

@codybear:
1.)Save image as
3.)???
4.)Profit

### #7 codybear

codybear
• Members
• 589 posts

Posted 16 April 2011 - 03:04 AM

@codybear:
1.)Save image as
3.)???
4.)Profit

hahhah. Yeah, I was trying to take the easy way out.

### #8 nimda

nimda
• Members
• 4301 posts

Posted 16 April 2011 - 11:48 AM

It's all done within the .htaccess file. All the hotlink wizardry, that is.

### #9 a4u

a4u
• Guests

Posted 16 April 2011 - 05:23 PM

This is why I wish I paid more attention in Algebra.

Pythagorean Theorem & Quadratic Formula - two things my Algebra II teacher said to Never Forget :wink:

### #10 PEG

PEG
• Guests

Posted 05 January 2012 - 03:30 PM

```distcords(X1,Y1,X2,Y2)
{
Return sqrt((Y2-Y1)**2+(X2-X1)**2)
;~ Round(sqrt((Y2-Y1)**2+(X2-X1)**2))

}```

```Usage:
distcords(0,0,100,100)

would return ~141.421... (the rounded version 141.421 = 141)```

### #11 Mickers

Mickers
• Members
• 1229 posts

Posted 05 January 2012 - 04:33 PM

Is this for land navigation?

### #12 Zaelia

Zaelia
• Members
• 706 posts

Posted 05 January 2012 - 11:31 PM

@Mickers: we will use other thing for land navigation, as "Orthodromy"
<!-- m -->http://en.wikipedia....circle_distance<!-- m -->
We need to use a lot trigonometry, else simple case is "Orthonormality" when "plan/map" is only in 2D and vector are in right angle and same unit length (therefore Pythagor), else only use vector formula (Chales and other)...

### #13 Mickers

Mickers
• Members
• 1229 posts

Posted 06 January 2012 - 01:40 PM

Mabye it's too early in the morning but I can't translate anything you just said... :lol:

### #14 IsNull

IsNull
• Fellows
• 990 posts

Posted 06 January 2012 - 04:23 PM

Mabye it's too early in the morning but I can't translate anything you just said... :lol:

I think she means that for real navigation calculations, complexer math would be requiered, as the world is not flat and even not a sphere. Pythagoras requires a (2D) right-angled triangle.

### #15 Mickers

Mickers
• Members
• 1229 posts

Posted 06 January 2012 - 04:52 PM

Ok.

I just wanted to know if this was for passing Army land navigation tests which I have a lot of experience with. I was going to give any advice he may / may not need. :wink: