Displaying and manipulating vectors in Geometry App

09102014, 09:30 AM
Post: #1




Displaying and manipulating vectors in Geometry App
Is there a way of displaying and manipulating vectors in Geometry App?
I can't find it, but I think this would great if students could see how vector addition, subtraction, angles between them, translations etc. work and relate to their coordinates. Cheers! 

09102014, 01:00 PM
(This post was last modified: 09102014 01:26 PM by Eddie W. Shore.)
Post: #2




RE: Displaying and manipulating vectors in Geometry App
I don't recall seeing any feature to draw vectors in the geometry app  I could be wrong.
I think we would have to plot vectors (using line segments?) manually.  For example, adding two vectors [5,3] and [1,6]. (let I be the imaginary number square root of 1, Shift+3, the point(x,y) command should also work as an alternative) Set the following objects  Symb screen: GA = point(0,0) GB = point(5,3) GC = segment(GA,GB) GD = point(5+1,3+6) GE = segment(GB,GD) GG = segment(GA,GD) ** result of addition (make this a different color) Num screen: coordinates(GD) and have this marked  that gives you the addition of "vectors" GC and GE. If you want angle, type in the Num screen: angle(GE,GC)  make sure you calculator is Degrees mode and you pick segments in a counterclockwise fashion (please see screen shots below)  If anyone has a better way to do this, please contribute. 

09102014, 01:58 PM
(This post was last modified: 09102014 01:59 PM by Angus.)
Post: #3




RE: Displaying and manipulating vectors in Geometry App
When drawing a vector you usually show its direction i.e. plot like an arrow.
You could try to do that by hand, however a specialized command could be helpful plus certainly faster and more comfortable. 

09102014, 07:27 PM
Post: #4




RE: Displaying and manipulating vectors in Geometry App
I was looking for lines that can be drawn with arrows, but no luck.


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