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 September 4th, 2012, 03:39 AM #1 Senior Member   Joined: Jul 2012 Posts: 225 Thanks: 0 Vectors in three dimensional space Point A is on the straight line x=(-1,-1,0)+t(2,-3,5) Point B is on the straight line x=(-1,6,-9)+s(1,-2,4) Point C(2,-3,6) is the middle of the vector AB. Find points A and B. Edit: in 2 dimensional space, if point B(Xb,Yb) is in the middle of the line AC A(Xa,Ya) C(Xc,Yc) then Xb=(Xa+Xc)/2 and Yb=(Ya+Yc)/2. Does that formula work in three dimensional space aswell?
 September 4th, 2012, 07:07 AM #2 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond Re: Vectors in three dimensional space
 September 4th, 2012, 12:23 PM #3 Senior Member   Joined: Jul 2012 Posts: 225 Thanks: 0 Re: Vectors in three dimensional space Thank you greg, that was helpful.

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