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
April 8th, 2014, 04:49 PM   #1
Newbie
 
Joined: Apr 2014
From: Wellington

Posts: 2
Thanks: 0

Unhappy How do you solve this??

I have a point inside a square that needs to rotate from the center by a given angle normally 90,180,270 but I may in the future want it to rotate by another angle.

So for example if I add 180degrees then the answer for a vector of (20,12) would change to (0, or if I add 270 it would change to (12,0).

Ive been trying to solve for ages but am out of my depth. IF you could solve that would be great.. if you could also tell me what i should be reading to learn how to solve would be fantastic..

Thankyou for any help
Glenn is offline  
 
April 8th, 2014, 05:54 PM   #2
Math Team
 
Joined: Dec 2013
From: Colombia

Posts: 7,671
Thanks: 2651

Math Focus: Mainly analysis and algebra
Can you not move your square so that the centre is at the origin? It makes the rotation a little easier.

As it is, I'd translate the centre to the origin, do the rotation and then translate it back again.
v8archie is offline  
April 8th, 2014, 06:21 PM   #3
Newbie
 
Joined: Apr 2014
From: Wellington

Posts: 2
Thanks: 0

Yes I can

Yeah I can move it, Then I Could just add the size and width to move it back again aye?

Thanks for your help..
Glenn is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
alegebra, solve, vector



Thread Tools
Display Modes






Copyright © 2019 My Math Forum. All rights reserved.