My Math Forum line computation questions

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 May 18th, 2007, 09:35 AM #1 Newbie   Joined: May 2007 Posts: 2 Thanks: 0 line computation questions 1. how do i compute the angle of the line from the origin? 2. how do i extend the line or make it longer?[/img]
May 18th, 2007, 10:01 AM   #2
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Quote:
 1. how do i compute the angle of the line from the origin?
Are you assuming that the line always goes through the origin? Most lines don't ever go through the origin, so you would not be able to find the angle relative to the origin unless you pretended that the origin lay somewhere on the line.

Quote:
 2. how do I extend the line or make it longer?
Just draw another x-step and another y-step, find the point that results, and then draw the line out to that new point. Another x step is equivalent to: |x1-x2| and another y step is equal to: |y1-y2| Pretend that the end of the line is the origin, and then draw out these steps in the direction you want to extend the line.

May 18th, 2007, 07:41 PM   #3
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Re: line computation questions

Quote:
 Originally Posted by hardc0d3r 1. How do I compute the angle of the line from the origin?
The origin is a point, and there is no such thing as the angle of a line from a point!

 May 18th, 2007, 08:02 PM #4 Newbie   Joined: May 2007 Posts: 2 Thanks: 0 ok.. sorry for my error there.. how do i compute for the angle that is relative to the x-axis or y-axis?
 May 19th, 2007, 03:33 AM #5 Senior Member   Joined: Nov 2006 From: I'm a figment of my own imagination :? Posts: 848 Thanks: 0 The slope of a line, defined as (y_2-y_1)/(x_2-x_1) for any two points (x_1,y_1) and (x_2,y_2) on that line, is the tangent of the angle θ that that line makes with the x-axis and the cotangent of the angle it makes with the y-axis.

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