
Trigonometry Trigonometry Math Forum 
 LinkBack  Thread Tools  Display Modes 
January 8th, 2015, 02:10 PM  #1 
Member Joined: Sep 2014 From: UK Posts: 82 Thanks: 1  The anticlockwise angle a vector makes with the positive x axis
I tried all possible answers and its says I'm wrong... vector b = 6i  8j So I drew the angle and found its magnitude: I need to find the angle it makes with the positive x axis. I found the angle by Tan^1(6/8 ) = 37 (2sf) To find the angle it makes with the positive x axis, I thought it was 143 since id imagine it would be 180  37 = 143. But apparently it's not. Any help? 
January 8th, 2015, 05:18 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,755 Thanks: 1405 
vector b = 6i  8j is in quad IV, not quad II

January 8th, 2015, 10:39 PM  #3 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 878 Thanks: 60 Math Focus: सामान्य गणित 
your graph should look like this.

January 8th, 2015, 10:49 PM  #4 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 878 Thanks: 60 Math Focus: सामान्य गणित 
This graph shows the magnitude and direction of $\displaystyle \underset{i}{\rightarrow}$ and $\displaystyle \underset{j}{\rightarrow}$

January 9th, 2015, 03:13 AM  #5 
Member Joined: Sep 2014 From: UK Posts: 82 Thanks: 1  Okay that makes sense! 36053 = 307 anticlockwise from the positive x axis, it's right, thank you!
Last edited by Tangeton; January 9th, 2015 at 03:16 AM. 

Tags 
angle, anticlockwise, axis, makes, positive, vector 
Search tags for this page 
the anticlockwise angle it makes,trigonometry in clock wise and anticlockwise,why the angle in the anti clock wise is positve,trigonometry anticlockwise,anticlockwise direction from xaxis,renoald quad,clock and anticlock in trigonometry
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Find angle on X & Y axis  erfg12  Algebra  2  August 3rd, 2014 04:00 AM 
How to get angle between Yaxis and two points...  TheSwede  Algebra  31  January 18th, 2014 08:26 AM 
Component Form of Vector Given Magnitude and Angle  M0ns7erS0u1  Linear Algebra  1  September 19th, 2013 12:41 PM 
Quick Question. Angle help! Vector problem  yogazen2013  Algebra  2  August 12th, 2013 01:51 AM 
The angle between three vector  renoald  Linear Algebra  3  October 31st, 2011 08:13 AM 