My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
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]
hardc0d3r is offline  
 
May 18th, 2007, 10:01 AM   #2
Senior Member
 
Joined: Dec 2006

Posts: 1,111
Thanks: 0

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.
Infinity is offline  
May 18th, 2007, 07:41 PM   #3
Global Moderator
 
Joined: Dec 2006

Posts: 20,613
Thanks: 2071

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!
skipjack is offline  
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?
hardc0d3r is offline  
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.
roadnottaken is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
computation, line, questions



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Computation of an integral. ZardoZ Complex Analysis 0 May 4th, 2013 01:12 PM
computation of pi (?) unm Number Theory 1 November 17th, 2012 09:58 AM
Computation of L(4) mathbalarka Calculus 9 August 31st, 2012 05:40 AM
computation problem islam Number Theory 16 November 25th, 2010 11:55 AM
Integral Computation. ZardoZ Calculus 5 November 12th, 2010 05:06 PM





Copyright © 2019 My Math Forum. All rights reserved.